An approach to 2, 2, 2-trifluoroethylidene derivatives from ketones was explored by employing the Corey-Winter's reductive elimination of 4-trifluoromethyl-1, 3-dioxolane-2-thiones to 2, 2, 2-trifluoroethylidene derivatives as a key step. The 1, 3-dioxolane-2-thione derivatives were readily prepared from ketones in five steps by sequential formation of O-silylated cyanohydrins, reduction, addition of trifluoromethyltrimethylsilane, desilylation, and formation of the 1, 3-dioxolane-2-thione system.
Comparative Molecular Field Analysis of Hydantoin Binding to the Neuronal Voltage-Dependent Sodium Channel
作者:Milton L. Brown、Congxiang C. Zha、Christopher C. Van Dyke、George B. Brown、Wayne J. Brouillette
DOI:10.1021/jm980556l
日期:1999.5.1
general features that result in enhanced binding to the sodiumchannel. These include a preferred 5-phenyl ring orientation and a favorable steric effect resulting from the C5-alkyl chain. This model was then utilized to accurately predict literature sodiumchannelactivities for hydantoins 14-20, which were not included in the training set. Finally the hydantoin CoMFA model was used to design the structurally