La synthese totale de l'aglycone du titre est effectuee, en particulier, l'etape d'agrandissement de cycle en 衍生 thiocinne est decrite, cette etape se fait via un ylure de sulfoniomethanure
La synthese totale de l'aglycone du titre est effectuee, en particulier, l'etape d'agrandissement de cycle en 衍生 thiocinne est decrite, cette etape se fait via un ylure de sulfoniomethanure
The preparation of compounds incorporating the 3-hydroxy-2-methyl-1-alkyl moiety of high diastereomeric purity is described. Such compounds can serve as potential building blocks for the preparation of several kinds of natural products. Diastereoselective synthesis of two potential pine sawfly pheromone components, one the pure racemic threo-isomer of 3-methylpentadecan-2-ol and the other the racemic erythro-isomer of 3-methyltridecan-2-ol are described. The diastereoselective addition of R2Zn (R = Me, Et and n-Bu) to several 2-alkyl-3-(arylsulfanyl)propanals in the presence of a Lewis acid and CH2Cl2 as solvent was studied. An excellent diastereomeric ratio (95/5 anti-Cram/Cram) was obtained with 2-[(phenylsulfanyl)methyl]pentanal, 2-[(phenylsulfanyl)methyl]decanal and 2-[(phenylsulfanyl)methyl]dodecanal and Me2Zn in the presence of TiCl4. (C) 2004 Elsevier Ltd. All rights reserved.
Asymmetric hydroformylations of sulfur-containing olefins catalyzed by BINAPHOS—Rh(I) complexes
Asymmetric hydroformylations of vinyl sulfides, allyl sulfides, and allyl sulfones catalyzed by (R,S)-BINAPHOS/Rh(acac)(CO)(2) afforded the corresponding branched oxo aldehydes as major products in 60-89% ee. Use of bulkier substituents on the sulfur in vinyl sulfides gave the branched oxo-aldehydes in higher regio- and enantioselectivities.
VEDEJS, E.;BUCHANAN, R. A.;CONRAD, P. C.;MEIER, G. P.;MULLINS, M. J.;SCHA+, J. AMER. CHEM. SOC., 111,(1989) N2, C. 8421-8430
作者:VEDEJS, E.、BUCHANAN, R. A.、CONRAD, P. C.、MEIER, G. P.、MULLINS, M. J.、SCHA+
DOI:——
日期:——
Total synthesis of d,1-methynolide. Medium-ring sulfides by ylide ring expansion
作者:E. Vedejs、R. A. Buchanan、P. C. Conrad、G. P. Meier、M. J. Mullins、J. G. Schaffhausen、C. E. Schwartz
DOI:10.1021/ja00204a015
日期:1989.10
La synthese totale de l'aglycone du titre est effectuee, en particulier, l'etape d'agrandissement de cycle en derive thiocinne est decrite, cette etape se fait via un ylure de sulfoniomethanure
La synthese totale de l'aglycone du titre est effectuee, en particulier, l'etape d'agrandissement de cycle en 衍生 thiocinne est decrite, cette etape se fait via un ylure de sulfoniomethanure