Simple, Catalytic Enantioselective Syntheses of Estrone and Desogestrel
作者:Qi-Ying Hu、Pankaj D. Rege、E. J. Corey
DOI:10.1021/ja048808x
日期:2004.5.1
Highly enantioselective and very shortsyntheses of the bioactive forms of estrone (3) and desogestrel (4) are described using a chiral oxazaborolidinium catalyst (2) in the key initial step. Enantiomerically pure estrone was synthesized in eight steps from the readily available starting materials diene 5 and alpha,beta-enal 6 viaintermediates 8 and 9. Desogestrel was synthesized using a similar strategy
Palladium-Catalyzed Enantioselective Allylic Alkylation of Thiocarboxylate Ions: Asymmetric Synthesis of Allylic Thioesters and Memory Effect/Dynamic Kinetic Resolution of Allylic Esters
作者:Bernhard J. Lüssem、Hans-Joachim Gais
DOI:10.1021/jo049756x
日期:2004.6.1
matched acetate of ≥99% ee and the mismatched acetate of ≥99% ee with KSAc. The acetates not only reacted with different enantioselectivities and rates but also suffered an unexpected and concomitant palladium-catalyzed racemization in the presence of the chiral ligand. This led in the case of the mismatched acetate to a temporary dynamic kinetic resolution (DKR) that featured a racemization of the
Cyclopentene monomers and methods of polymerization
申请人:Florida State University Research Foundation, Inc.
公开号:US11136426B2
公开(公告)日:2021-10-05
Cyclopentene monomers and methods of polymerization, including the polymerization of the cyclopentene monomers. The cyclopentene monomers include allylic substituted cyclopentene monomers that may be racemic or enantiopure. The methods of polymerization may permit the resulting polymers to have one or more desirable structural features.
Synthesis of enantiomerically pure (R)-2-cycloalken-1-ols using highly enantioselective enzymatic transesterification
作者:Tetsuya Fukazawa、Toshihiko Hashimoto
DOI:10.1016/s0957-4166(00)80093-2
日期:1993.11
Optically pure (R)-2-cycloalken-1-ols were synthesized via highly enantioselective lipase-catalyzed transesterification of 2-substituted cycloalkanols.
COREY, E. J.;CHEN, C. -P.;REICHARD, GREGORY A., TETRAHEDRON LETT. , 30,(1989) N1, C. 5547-5550