Electronic control of stereoselectivity. 14. Long-range control by norbornane frameworks of cyclopentadienide reactivity. Stereoselective capture of electrophiles by tricyclo[5.2.1.02,6]deca-3,8-dienyl anions
Electronic control of stereoselectivity. 14. Long-range control by norbornane frameworks of cyclopentadienide reactivity. Stereoselective capture of electrophiles by tricyclo[5.2.1.02,6]deca-3,8-dienyl anions
(-)-beta-Vetivone ((-)3a), one of the main constituents of vetiver oil, was submitted to a structure/odor relationship study. The influence of the Me groups at the cyclohexenone ring and of the configuration on the odor was examined. Detailed H-1- and C-13-NMR-spectroscopic data were collected, and the absolute configurations were determined by CD methods.
(-)-β-愈创木烯 [(-)-3a],作为 vetiver 油的主要成分之一,进行了结构/气味关系研究。研究了环己烯酮环上的 Me 组团以及构型对气味的影响。收集了详细的 H-1- 和 C-13-NMR 波谱数据,并通过 CD 方法确定了绝对构型。
Synthesis and biological activity of 22-oxa CD-ring modified analogues of 1α,25-dihydroxyvitamin D3: cis-perhydrindane CE-ring analogues
作者:Samuël Demin、Dirk Van Haver、Maurits Vandewalle、Pierre J De Clercq、Roger Bouillon、Annemieke Verstuyf
DOI:10.1016/j.bmcl.2004.05.067
日期:2004.8
The synthesis and biologicalactivity of novel CD-ring modifiedanalogues of 22-oxa-1alpha,25-dihydroxyvitamin D(3), lacking the D-ring and featuring a connection between C-12 and C-21 (cis-perhydrindane CE-ring analogues), is described. The synthesis of the CE-ring system follows Meyers' methodology for the preparation of enantiomerically pure hydrinden-2-ones. The analogues show a complete lack of
Asymmetric Synthesis of (7aS)-7a-Methyl-4,5,7,7a-tetrahydro-1H-indene-2,6-dione and Useful Derivatives Thereof
作者:Samuël Demin、Dirk Van Haver、Pierre De Clercq
DOI:10.3390/11090707
日期:——
The enantioselective synthesis of the title compound, using Meyers' bicyclic lactam methodology, is described. This compound and a few of its derivatives are useful intermediates in natural product synthesis.
Cleavage of carbon-carbon bonds with high stereochemical control. 7. Chiral .alpha.-silyl benzoylcycloalkanes undergo base-catalyzed cleavage with retention of configuration when not sterically congested
作者:Leo A. Paquette、George D. Maynard、Choon Sup Ra、Manfred Hoppe