In the presence of a catalytic amount of Lewis acid, various carboxylic esters or S-phenyl carbothioates are prepared in excellent yields by the respective reactions of equimolar amounts of silyl carboxylates and alkyl silyl ethers or phenyl silyl sulfides with 4-trifluoromethylbenzoic anhydride.
Various carboxylic esters are prepared in excellent yields by the reaction of nearly equimolar amounts of silyl derivatives of carboxylicacids and alcohols with p-trifluoromethylbenzoic anhydride in the presence of a catalytic amount of Lewis acid.
An Efficient Synthesis of 4-Heterofunction-Substituted 3-(1-Hydroxy)ethylazetidin-2-ones from 3-(1-Hydroxy)ethyl-4-phenylsulfinylazetidin-2-one by Reaction with Silylated Heteronucleophiles.
3-(1-tert-Butyldimethylsiloxy)ethyl-4-sulfinylazetidin-2-one was reacted with silylated N-, S-, O-, and P-nucleophiles in the presence of a catalytic amount of ZnI2 to give the corresponding trans-4-heterofunction-substituted azetidin-2-ones in high yelids.
Bis(triméthylsiloxy)-1,1 butadiène-1,3 et triméthylsilyl-4 butène-2 oate de triméthylsilyle: préparations et réactions avec le benzaldéhyde
作者:M. Bellassoued、R. Ennigrou、M. Gaudemar
DOI:10.1016/0022-328x(88)80497-2
日期:1988.1
The preparations of 4-trimethylsilyl-2-butenoate trimethylsilyl ester and 1,1- bis(trimethylsiloxy)-1,3-butadiene are described. The latter silyl derivative reacts with benzaldehyde in the presence of ZnBr2 in THF to give exclusively γ-substituted product (E configuration) in high yield. The fluoride ion catalyzedreaction affords predominantly α-alkylated compounds.