Preparation of disubstituted epichlorohydrins with total diastereoselectivity. Transformation of α-bromocarbonyl compounds into allyl alcohols.
作者:José Barluenga、Luján Llavona、Pablo L. Bernad、José M. Concellón
DOI:10.1016/s0040-4039(00)93410-5
日期:1993.5
Epichlorohydrins 3 have been obtained with total diastereoselectivity from α-bromocarbonyl compounds and chloromethyllithium generated in situ. The treatment of compounds 3 with lithium iodide or lithium powder affords allyl alcohols 4 in a regioselective manner.
Highly diastereoselective synthesis of substituted epichlorohydrins and regioselective preparation of allyl alcohols using chloro or iodomethyllithium
作者:JoséM. Concellón、Luján Llavona、Pablo L. Bernad
DOI:10.1016/0040-4020(95)90943-q
日期:1995.5
Substituted epichlorohydrins 3 or 6 are obtained from α-bromo or α-chlorocarbonyl compounds (1 or 4) and chloro or iodomethyllithium, respectively. Starting from α-bromocarbonyl compounds 1 or acyclic α-chloro ketones the reaction takes place with total diastereoselectivity. Treatment of epichlorohydrins 3 or 6 with lithium iodide affords the same substituted allyl alcohols 7 in a regioselective manner
1,(3,)5-SUBSTITUTED IMIDAZOLES, THEIR USE IN THE TREATMENT OF HYPERTENSION AND METHODS FOR THEIR PREPARATION
申请人:Matsoukas John
公开号:US20100166837A1
公开(公告)日:2010-07-01
The present invention provides novel 1,5 and 1,3,5-substituted imidazole compounds in hydrophilic or lipophilic form, which are useful as angiotensin II ATI receptor antagonists suitable for transdermal delivery. The invention also provides pharmaceutical compositions containing such compounds, processes and intermediates for preparing compounds and their use in methods of treating hypertension and cardiovascular diseases.
A novel, stereoselective total synthesis of d,l-canadensolide by application of the two-phase reaction (Bu4NBr, benzene-H2O) of 2-bromohexanal with 1,1,2-ethanetricarboxylic acid 2-tert-butyl, 1-ethyl ester, 1-potassium salt (6a) is described.
It was found that various kinds of α-substituted carbonyl-stabilized sulfoniumylides were conveniently prepared from the corresponding sulfonium salts by treating with 50% aqueous sodium hydroxide. The reactions of sulfoniumylides with succinic anhydride afforded furofuran derivative by one step procedure in yields ranging these from 5 to 14%. The structures of furofuran derivatives were confirmed