R. R. Schrock, J. S. Murdzek, G. C. Bazan, J. Robbins, M. Dimare et al., Synthesis of molybdenum imido alkylidene complexes and some reactions involving acyclic olefins, Journal of the American Chemical Society, vol.112, issue.10, pp.3875-3886, 1990.
DOI : 10.1021/ja00166a023

S. T. 66-nguyen, L. K. Johnson, R. H. Grubbs, R. H. Grubbs, S. Miller et al., Ring-opening metathesis polymerization (ROMP) of norbornene by a Group VIII carbene complex in protic media, Journal of the American Chemical Society, vol.114, issue.10, pp.3974-3975, 1992.
DOI : 10.1021/ja00036a053

M. Schuster and S. Blechert, Olefin Metathesis in Organic Chemistry, Angewandte Chemie International Edition in English, vol.36, issue.19, pp.2036-2056, 1997.
DOI : 10.1002/anie.199720361

A. Fürstner, Olefin Metathesis and Beyond, Angewandte Chemie, vol.11239, issue.17, pp.3012-3043, 2000.
DOI : 10.1002/1521-3773(20000901)39:17<3012::AID-ANIE3012>3.0.CO;2-G

A. H. Hoveyda, R. R. Schrock, and R. H. Grubbs, Handbook of Metathesis, Classics in Total Synthesis, Part II, pp.4592-4633, 2003.

A. Deiters and S. F. Martin, Synthesis of Oxygen- and Nitrogen-Containing Heterocycles by Ring-Closing Metathesis, Chemical Reviews, vol.104, issue.5, pp.2199-2238, 2004.
DOI : 10.1021/cr0200872

A. H. Hoveyda, D. G. Gillingham, J. J. Van-veldhuizen, K. Kataoka, S. B. Garber et al., Ru complexes bearing bidentate carbenes: from innocent curiosity to uniquely effective catalysts for olefin metathesis, Organic & Biomolecular Chemistry, vol.2, issue.1, pp.8-23, 2004.
DOI : 10.1039/b311496c

. Beyond, A. Fürstner, and R. H. Grubbs, Metathesis 10 th Belgian Organic Synthesis Symposium, Tetrahedron Chair Lecture Notes Tetrahedron, vol.12, issue.60, pp.7117-7140, 2004.

T. Kitamura, Y. Kuzuba, Y. Sato, H. Wakamatsu, R. Fujita et al., ROM-RCM of cycloalkene-yne, Tetrahedron, vol.60, issue.34, pp.7375-7389, 2004.
DOI : 10.1016/j.tet.2004.05.030

M. Rosillo, G. Domínguez, L. Casarrubos, and U. Amador, Tandem Enyne Metathesis-Diels???Alder Reaction for Construction of Natural Product Frameworks, The Journal of Organic Chemistry, vol.69, issue.6, pp.2084-2093, 2004.
DOI : 10.1021/jo0356311

A. R. Katritzky, S. K. Nair, T. Khokhlova, and N. G. Akhmedov, Efficient Synthesis of Enynecarbamates and Their Ring-Closing Metathesis/[4 + 2] Diels???Alder Cycloaddition:?? Synthesis of Hexahydroisoquinolines, The Journal of Organic Chemistry, vol.68, issue.14, pp.5724-5727, 2003.
DOI : 10.1021/jo0340408

J. Huang, H. Xiong, R. P. Hsung, C. Rameshkumar, J. A. Mulder et al., The First Successful Base-Promoted Isomerization of Propargyl Amides to Chiral Ynamides. Applications in Ring-Closing Metathesis of Ene???Ynamides and Tandem RCM of Diene???Ynamides, Organic Letters, vol.4, issue.14, pp.2417-2420, 2002.
DOI : 10.1021/ol020097p

I. Inoue and T. Mukaiyama, Dialkylboryl Triflates, Bulletin of the Chemical Society of Japan, vol.53, issue.1, pp.174-178, 1980.
DOI : 10.1246/bcsj.53.174

D. A. Evans, J. V. Nelson, E. Vogel, and T. R. Taber, Stereoselective aldol condensations via boron enolates, Journal of the American Chemical Society, vol.103, issue.11, pp.3099-3111, 1981.
DOI : 10.1021/ja00401a031

D. A. Evans, J. R. Gage, and J. L. Leighton, Total synthesis of (+)-calyculin A, Journal of the American Chemical Society, vol.114, issue.24, pp.9434-9453, 1992.
DOI : 10.1021/ja00050a024

P. Mohr, Stereoselective synthesis of syn-1,3-diols, Tetrahedron Letters, vol.32, issue.20, pp.2219-2222, 1991.
DOI : 10.1016/S0040-4039(00)79685-7

K. 142-narasaka and F. Pai, Stereoselective reduction of ?? hydroxyketones to 1,3-diols highly selective 1,3-asymmetric induction via boron chelates, Tetrahedron, vol.40, issue.12, pp.2233-2238, 1984.
DOI : 10.1016/0040-4020(84)80006-X

K. M. Chen, G. E. Hardtmann, K. Prasad, O. Repi?, and M. Shapiro, 1,3- diastereoselective reduction of ??-hydroxyketones utilizing alkoxydialkylboranes, Tetrahedron Letters, vol.28, issue.2, pp.155-158, 1987.
DOI : 10.1016/S0040-4039(00)95673-9

D. A. Evans and A. H. Hoveyda, Reduction of .beta.-hydroxy ketones with catecholborane. A stereoselective approach to the synthesis of syn-1,3-diols, The Journal of Organic Chemistry, vol.55, issue.18, pp.5190-5192, 1990.
DOI : 10.1021/jo00305a005
URL : https://hal.archives-ouvertes.fr/jpa-00214474

S. D. 145-rychnovsky, B. N. Rogers, and T. I. Richardson, C]Acetonide Analysis, Accounts of Chemical Research, vol.31, issue.1, pp.9-17, 1998.
DOI : 10.1021/ar960223n

. De-façon-générale, il est conseillé d'éviter d'utiliser un lot ouvert après 1 ou 2 mois. 148 Pour une séquence similaire sans protection de l'alcool

E. Lee, H. Y. Song, J. W. Kong, D. S. Kim, C. K. Jung et al., Lasonolide A:?? Structural Revision and Synthesis of the Unnatural (???)-Enantiomer, Journal of the American Chemical Society, vol.124, issue.3, pp.384-385, 2002.
DOI : 10.1021/ja017265d

J. Boukouvalas, G. Fortier, and I. I. Radu, -Kumausyne via Tandem Intramolecular Alkoxycarbonylation???Lactonization, The Journal of Organic Chemistry, vol.63, issue.4, pp.916-917, 1998.
DOI : 10.1021/jo972066r
URL : https://hal.archives-ouvertes.fr/hal-00636583

B. M. Trost and P. R. Hanson, A practical asymmetric synthesis of a 1,7-enyne A-ring synthon en route toward the total synthesis of vitamin D3 analogues, Tetrahedron Letters, vol.35, issue.44, pp.8119-8122, 1994.
DOI : 10.1016/0040-4039(94)88259-2

E. P. Krebs and R. Keese, Synthese einiger 1,2-Dihalogen-norbornane, Helvetica Chimica Acta, vol.61, issue.7, pp.2029-2037, 1982.
DOI : 10.1002/hlca.19820650710

I. Gillouzeau, S. Charamon, and L. A. Agrofoglio, Enantioselective synthesis of carba-l-furanose precursors of carbanucleosides, using ring-closing metathesis, Tetrahedron Letters, vol.42, issue.50, pp.8817-8819, 2001.
DOI : 10.1016/S0040-4039(01)01905-0

C. S. Callam and T. L. Lowary, -arabinofuranosides, Organic Letters, vol.2, issue.2, pp.167-169, 2000.
DOI : 10.1021/ol9912682
URL : https://hal.archives-ouvertes.fr/hal-00535325

M. T. Crimmins, B. W. King, W. J. Zuercher, and A. L. Choy, An Efficient, General Asymmetric Synthesis of Carbocyclic Nucleosides:?? Application of an Asymmetric Aldol/Ring-Closing Metathesis Strategy, The Journal of Organic Chemistry, vol.65, issue.25, pp.8499-8509, 2000.
DOI : 10.1021/jo005535p

T. Sunazuka, T. Hirose, T. Shirahata, Y. Harigaya, M. Hayashi et al., Total Synthesis of (+)-Madindoline A and (???)-Madindoline B, Potent, Selective Inhibitors of Interleukin 6. Determination of the Relative and Absolute Configurations, Journal of the American Chemical Society, vol.122, issue.9, pp.2122-2123, 2000.
DOI : 10.1021/ja9938074

J. S. Kingsbury, J. P. Harrity, P. J. Bonitatebus, and A. H. Hoveyda, A Recyclable Ru-Based Metathesis Catalyst, 83% 92% (+ -)-49, pp.791-799, 1999.
DOI : 10.1021/ja983222u

M. Nakazawa, Y. Sakamoto, T. Takahashi, K. Tomooka, K. Ishikawa et al., A new approach to asymmetric synthesis of Stork's prostaglandin intermediate, Tetrahedron Letters, vol.34, issue.37, pp.5923-5926, 1993.
DOI : 10.1016/S0040-4039(00)73815-9

L. A. Paquette, L. H. Kuo, A. Hamme, R. Krenzholz, and J. Doyon, Sensitivity of Substitution to the Extent of Self-Immolative Chirality Transfer during Reaction Cascades Originating from Squarate Esters, The Journal of Organic Chemistry, vol.62, issue.6, pp.1730-1736, 1997.
DOI : 10.1021/jo962182e

L. A. Thompson, F. L. Moore, Y. C. Moon, and J. A. Ellman, Solid-Phase Synthesis of Diverse E- and F-Series Prostaglandins, The Journal of Organic Chemistry, vol.63, issue.7, pp.2066-2067, 1998.
DOI : 10.1021/jo9800762

M. M. Kabat, J. Kiegiek, N. Cohen, K. Toth, P. M. Wovkulich et al., Metabolites. Control of the Stereoselectivity in Samarium-Induced Cyclopropanations of Cyclopentenes, The Journal of Organic Chemistry, vol.61, issue.1, pp.118-124, 1996.
DOI : 10.1021/jo951229d

V. 180-farina and B. Krishnan, Large rate accelerations in the stille reaction with tri-2-furylphosphine and triphenylarsine as palladium ligands: mechanistic and synthetic implications, Journal of the American Chemical Society, vol.113, issue.25, pp.9585-9595, 1991.
DOI : 10.1021/ja00025a025

R. Hayashi, S. Fernández, W. R. Okamura, . Org, and . Lett, 182 L'utilisation de bromure de vinylmagnésium en présence de Pd(Ph 3 ) 4 dans les conditions de Kumada n'a pas été tentée, 181 Pour une stratégie similaire, pp.851-854, 1998.

M. J. Fisher, W. J. Hehre, S. D. Kahn, and L. E. Overman, Face selectivity in Diels-Alder reactions of chiral dienes containing allylic substituents, Journal of the American Chemical Society, vol.110, issue.14, pp.4625-4633, 1988.
DOI : 10.1021/ja00222a022

C. A. 183-pour-un-exemple:-hoeger, A. D. Johnston, and W. H. Okamura, Studies of vitamin D (calciferol) and its analogs. 30. Thermal [1,7]-sigmatropic hydrogen shifts: stereochemistry, kinetics, isotope effects and .pi.-facial selectivity, Journal of the American Chemical Society, vol.109, issue.15, pp.4690-4698, 1987.
DOI : 10.1021/ja00249a035

J. P. Sostelo, J. L. Mascareñas, L. Castedo, and A. Mouriño, Ultrasonically induced conjugate addition of iodides to electron-deficient olefins and its application to the synthesis of side-chain analogs of the hormone 1.alpha.,25-dihydroxyvitamin D3, The Journal of Organic Chemistry, vol.58, issue.1, pp.118-123, 1993.
DOI : 10.1021/jo00053a023

R. D. Rieke, W. N. Aldrichimica-acta-chou, D. L. Clark, N. N. Chou, J. D. White et al., Pour l'utilisation du zinc de Rieke dans la réduction sélective des alcynes : White 187 L'utilisation de zinc activé par KCN n'a pas donné de résultat satisfaisant, J. B Tetrahedron Lett. J. Am. Chem. Soc. Helv. Chim. Acta, vol.33, issue.58, pp.52-60, 1975.

H. Mosimann, P. Vogel, A. A. Pinkerton, K. Kirschbaum, B. L. Sondengam et al., 188 Pour d'autres méthodes de réduction stéréosélective de triple liaison : Couple Zn, J. Org. Chem. Tetrahedron Lett, vol.62, issue.21, pp.3002-3007, 1980.

R. Mayer, H. J. Rigassi, N. Scwieter, U. Weedon, and B. C. , Synthesis of Abscisic Acid, Helvetica Chimica Acta, vol.1965, issue.5, pp.1424-1427, 1976.
DOI : 10.1002/hlca.19760590503

K. Kim, Y. Guo, and G. A. Sulikowski, Synthetic Studies of the Angucycline Antibiotics. Stereocontrolled Assembly of the SF 2315B Ring System, The Journal of Organic Chemistry, vol.60, issue.21, pp.6866-6871, 1995.
DOI : 10.1021/jo00126a043

B. Cyano:-bienfait, G. Coppe-motte, R. Merényi, H. G. Viehe, W. Sicking et al., ??-Cyanocyclobutenone as a highly reactive dienophile in comparison to ??-cyanocyclopentenone., Tetrahedron, vol.47, issue.38, pp.8167-8176, 1991.
DOI : 10.1016/S0040-4020(01)91012-9

D. Formyl:-liotta, M. Saindane, and C. Barnum, Diels-Alder reactions involving cross-conjugated dienones. Effects of substitution on reactivity, Journal of the American Chemical Society, vol.103, issue.11, pp.3224-3226, 1981.
DOI : 10.1021/ja00401a056

L. A. Sulfone:-paquette and G. D. Crouse, An indirect method for engaging unactivated alkenes as effective dienophiles in regioselective Diels-Alder reactions, The Journal of Organic Chemistry, vol.48, issue.1, pp.141-142, 1983.
DOI : 10.1021/jo00149a035

E. J. Nitro:-corey and H. Estreicher, 3-Nitrocycloalkenones, synthesis and use as reverse affinity cycloalkynone equivalents, Tetrahedron Letters, vol.22, issue.7, pp.603-608, 1981.
DOI : 10.1016/S0040-4039(01)92500-6

B. H. Lipshutz, E. L. Ellsworth, S. H. Dimock, and R. A. Smith, New methodology for conjugate additions of allylic ligands to .alpha.,.beta.-unsaturated ketones: synthetic and spectroscopic studies, Journal of the American Chemical Society, vol.112, issue.11, pp.4404-4410, 1990.
DOI : 10.1021/ja00167a043

R. E. Donaldson, J. C. Saddler, S. Byrn, A. T. Mckenzie, and P. L. Fuchs, Syntheses via vinyl sulfones. 11. A triply convergent total synthesis of L-(-)-prostaglandin E2, The Journal of Organic Chemistry, vol.48, issue.13, pp.2167-2188, 1983.
DOI : 10.1021/jo00161a010

A. Csákÿ, M. Mba, J. Plumet, K. Tanaka, and T. Kitano, Regio- and Stereoselective Addition of Grignard and Organolithium Reagents to 4-Hydroxy-2-cyclopentenones, The Journal of Organic Chemistry, vol.66, issue.26, pp.9026-9029, 2000.
DOI : 10.1021/jo0106389

S. J. Danishefsky, M. P. Cabal, and K. Chow, Novel stereospecific silyl group transfer reactions: practical routes to the prostaglandins, Journal of the American Chemical Society, vol.111, issue.9, pp.3456-3457, 1989.
DOI : 10.1021/ja00191a067

K. Chow and S. Danishefsky, Total synthesis of 13-oxygenated prostanoids derived from arachidonate: an instance of extraordinary variability in the stereochemical sense of a Mukaiyama aldol reaction, The Journal of Organic Chemistry, vol.54, issue.26, pp.6016-6018, 1989.
DOI : 10.1021/jo00287a009

J. Otera, Y. Fujita, S. Fukuzumi, K. Hirai, J. H. Gu et al., Diastereocontrol in Lewis acid-catalyzed Michael reactions of 4-siloxycyclopentenone with ketene silyl acetals: Stereoelectronic vs. steric effect, 313 Pour une discussion mécanistique, pp.95-98, 1995.
DOI : 10.1016/0040-4039(94)02174-A

K. Laumen and M. Schneider, Enzymatic hydrolysis of prochiral -1,4-diacyl-2-cyc-lopentenediols: preparation of (1,4)-and (1,4)-4-hydroxy-2-cyclopentenylderivatives, versatile building blocks for cyclopentanoid natural products., Tetrahedron Letters, vol.25, issue.51, pp.5875-5878, 1984.
DOI : 10.1016/S0040-4039(01)81708-1

D. R. Deardorff, A. J. Matthews, D. S. Mcmeehin, and C. L. Craney, A highly enantioselective hydrolysis of -3,5-diacetoxycyclopent-1-ene., Tetrahedron Letters, vol.27, issue.11, pp.1255-1256, 1986.
DOI : 10.1016/S0040-4039(00)84231-8

C. R. Johnson and S. J. Bis, Enzymatic asymmetrization of meso-2-cycloalken-1,4-diols and their diacetates in organic and aqueous media, Tetrahedron Letters, vol.33, issue.48, pp.7287-7290, 1992.
DOI : 10.1016/S0040-4039(00)60167-3

Y. Zeng, P. Desai, J. Aubé, and . Org, C-Alkylation avec le réactif de Mander 367 Gracias, 72% Schéma Lett, vol.260, issue.5, pp.4999-5001, 2003.

C. R. Johnson and R. K. Raheja, Hydrosilylation of enones: platinum divinyltetramethyldisiloxane complex in the preparation of triisopropylsilyl and triphenylsilyl enol ethers, The Journal of Organic Chemistry, vol.59, issue.9, pp.2287-2288, 1994.
DOI : 10.1021/jo00088a006

L. N. Mander and S. P. Sethi, Regioselective synthesis of ??-ketoesters from lithium enolates and methyl cyanoformate, Tetrahedron Letters, vol.24, issue.48, pp.5425-5428, 1983.
DOI : 10.1016/S0040-4039(00)87886-7

H. Miyaoka, T. Watanubi, Y. Saka, and Y. Yamada, SYNTHESES OF OPTICALLY ACTIVE (+)- AND (???)-UNTENONE A, Tetrahedron, vol.51, issue.32, pp.8749-8756, 1995.
DOI : 10.1016/0040-4020(95)00465-K

H. 443-hagiwara, T. Katsumi, S. Endou, T. Hoshi, and T. Suzuki, Domino ring opening???ring closing metathesis (ROM???RCM) strategy toward bicyclo[n.3.0]cycloalkenes, Tetrahedron, vol.58, issue.33, pp.6651-6654, 2002.
DOI : 10.1016/S0040-4020(02)00690-7

W. Herz, V. S. Iyer, and M. G. Nair, Reaction of enedione epoxides with base, The Journal of Organic Chemistry, vol.40, issue.24, pp.3519-3521, 1975.
DOI : 10.1021/jo00912a011

M. C. Böhm, R. V. Carr, R. Gleiter, and L. A. Paquette, Electronic control of stereoselectivity. 4. Effects of neighboring fused bicyclic frameworks on the stereochemical outcome of Diels-Alder cycloadditions to cyclopentadiene rings, 445 Pour une stratégie alternative, pp.7218-7228, 1980.
DOI : 10.1021/ja00544a008

J. C. 446-barborak, D. Khoury, W. F. Maier, P. R. Schleyer, E. C. Smith et al., Correlation of structure and transannular interactions in a series of cage compounds, The Journal of Organic Chemistry, vol.44, issue.26, pp.4761-4766, 1979.
DOI : 10.1021/jo00394a004

A. P. Marchand and S. Chander-suri, Synthesis of 3,5,5-trinitropentacyclo[5.3.0.02,6.03,10.04,8]decane, The Journal of Organic Chemistry, vol.49, issue.11, pp.2041-2043, 1984.
DOI : 10.1021/jo00185a051

A. J. Klunder, W. G. De-valk, J. M. Verlaak, J. W. Schellekens, J. H. Noordik et al., Nucleophilic eliminative ring fission of bridgehead substituted 1,3-bishomocubyl acetates, Tetrahedron, vol.41, issue.5, pp.963-973, 1985.
DOI : 10.1016/S0040-4020(01)96416-6

R. B. Garland, M. Miyano, D. Pineh, M. Clare, P. M. Finnegan et al., Studies in the synthesis of the thromboxane receptor antagonist EP 092 and its enantiomers, The Journal of Organic Chemistry, vol.55, issue.23, pp.5854-5861, 1990.
DOI : 10.1021/jo00310a017

1. Hz and H. , 19 (dt, J = 10.5, 1.5 Hz, pp.4-18

2. Hz and O. J. , 79 (br s, 1H, OH), pp.61-62

3. Hz, 91 (s, 9H, SiC(CH 3 ) 3 ), 0.90 (s, 9H, SiC(CH 3 ) 3 ), 0, pp.0-09

1. Hz and H. , 66 (m, 1H, H-3), 3.69 (s, 3H, OCH 3 ), 3.17 (s, 3H, NCH 3, pp.4-72

. Anal, Calcd for C 13 H 27 NO 3 Si: C, 57.10; H, 9.95. Found: C, 56.66, pp.10-11

1. Hz and H. , 06 (s, 9H, SiC(CH 3 ) 3 )

1. Hz and H. , 31 (br s, 1H, p.2928

1. Hz and H. , 24 (br s, 1H, p.7

1. Hz and H. , 4.81 (br s, 1H, p.72

1. Hz and H. , 53 (s, 3H, CH 3 -acetonide), 1.51 (s, 3H, CH 3 -acetonide), 0, p.74

1. Hz and H. , 40 (br s, 2H, pp.34-39

1. Hz and H. , 18 (br s, 1H

1. Hz and H. , 06 (s, 9 H, SiC(CH 3 ) 3 ), 0.93 (s, 9 H, SiC(CH 3 ) 3 )

1. Hz and H. , 90 (s, 9H, SiC(CH 3 ) 3 ), 0

1. Hz and H. , 89 (s, 9H, SiC(CH 3 ) 3 ), 0.205 (s, 9H, pp.3-3

J. =. Dt, H-5), 0.92 (s, 9H, SiC(CH 3 ) 3 ), 0.88 (s, 9H, SiC(CH 3 ) 3 ), 0.19 (s, 9H, 3xSi(CH 3 )), 0, dt, J = 12.9 Hz, 6.4 Hz, pp.6861-6861

1. Hz and H. , 02 (s, 1H, p.63

1. Hz and H. , 92 (s, 9H, SiC(CH 3 ) 3 ), 0.89 (s, 9H, SiC(CH 3 ) 3 ), 0, p.13

1. Hz and H. , 90 (s, 18H, 2×SiC(CH 3 ) 3 ), 0.12 (s, 3H, Si(CH 3 )), 0, pp.0-08

1. Hz and H. , 91 (s, 9H, SiC(CH 3 ) 3 ), 0.88 (s, 3H, Si(CH 3 )), 0.13 (s, 3H, Si(CH 3 ) 2 ), 0, p.10

1. Hz and H. , 91 (s, 9H, SiC(CH 3 ) 3 ), 0.90 (s, 9H, SiC(CH 3 ) 3 ), 0.23 (s, 9H, Si(CH 3 ) 3 ), 0, pp.0-09

1. Hz and H. , 1.36 (d, J = 8.4 Hz, 1H, H-17), 0.95 (s, 9H, SiC(CH 3 ) 3 ), 0, pp.0-16

. Sic, SiC(CH 3 ) 3 ), SiC(CH 3 ) 3 )

. Anal, Calcd for C 13 H 23 BrO 2 Si: C, 48.90; H, 7.26. Found: C, 49.09, pp.7-14

. Sic, 93 (s, 9H, SiC(CH 3 ) 3 ), 0.21 (s, 3H, Si(CH 3 )), 0, pp.0-08

1. Hz and H. , 00- 1.96 (m, 1H, H-11), 1.92-1, pp.70-72

. Sic, 1 (SiC(CH 3 ) 3 ), SiC(CH, vol.18, issue.34×Si, pp.25-31, 2002.

1. Hz and H. , 90 (s, 9H, SiC(CH 3 ) 3 , 0.89 (s, 9H, SiC(CH 3 ) 3, 0, pp.0-06

9. Sic, CH 3 ) 3 ), 0.91 (s, 9H, SiC(CH 3 ) 3 ) 0.21 (s, 3H, Si(CH 3 )), 0.14 (s, 3H, Si(CH 3 )), 0, pp.0-06

1. Hz and H. , (q, J = 10.8 Hz, 1H, H-6-b), 0.93 (s, 9H, SiC(CH 3 ) 3 ), 0.90 (s, 9H, SiC(CH 3 ) 3 ) 0, pp.75-75

1. Hz and H. , 77 (s, 3H, OCH 3 ), 3.21 (d, J = 12, Hz, vol.3, issue.2 68, p.78

1. Hz, H. , J. =dd, and J. =. , 63 (d, J = 12, Hz, 1H, H-8), 2.53-2.43 (m, 2H, H-4), 2.24-2.11 (m, 2H, H-5, pp.7335-7335

. Mann, The procedure used was described by Deardoff et al Org, Syn Chem. Soc., Perkin Trans, vol.73, issue.1, pp.25-35, 1995.

1. Hz and H. , 64 (m, 1H, H-2 or H-5), 4.59 (br s, pp.4-68

1. Hz and H. , 80 (br s, 1H, H-9 or H-12), 2.51 (br s, 1H, H-12 or H-9, ), 2.00-1.94 (m, 1H, pp.85-90

1. Hz and H. , 10 (br s, 1H, H-9 or H-12), 2.78 (br s, H-12 or H-9, pp.11-16