Short Enantioselective Syntheses of trans-5-Alkylprolines from New Functionalized Amino Alcohols
摘要:
GraphicsAmino alcohols, having an enol ether function, cyclized in acidic medium to give quantitatively diastereosomerically pure bicyclic compounds that were transformed in five steps in enantiopure trans-5-alkylproline derivatives.
Short Enantioselective Syntheses of trans-5-Alkylprolines from New Functionalized Amino Alcohols
摘要:
GraphicsAmino alcohols, having an enol ether function, cyclized in acidic medium to give quantitatively diastereosomerically pure bicyclic compounds that were transformed in five steps in enantiopure trans-5-alkylproline derivatives.
Asymmetric Syntheses of 2-Substituted and 2,5-Disubstituted Pyrrolidines from (3<i>S</i>,5<i>R</i>,7a<i>R</i>)-5-(Benzotriazol-1-yl)-3-phenyl[2,1-<i>b</i>]oxazolopyrrolidine
作者:Alan R. Katritzky、Xi-Lin Cui、Baozhen Yang、Peter J. Steel
DOI:10.1021/jo9821426
日期:1999.3.1
1-b]oxazolopyrrolidine (6), whose crystal structure was confirmed by X-ray crystallography. Novel chiral pyrrolidine synthon 6 reacts with organosilicon (allyltrimethylsilanes and vinyloxytrimethylsilanes), organophosphorus, organozinc, and Grignard reagents to afford chiral 2-substituted and 2,5-disubstitutedpyrrolidines.
A short asymmetric synthesis of 2,5-disubstituted pyrrolidines
作者:Alan R. Katritzky、Xi-Lin Cui、Baozhen Yang、Peter J. Steel
DOI:10.1016/s0040-4039(98)00134-8
日期:1998.3
A novel approach to chiral 2,5-disubstitutedpyrrolidines, starting from chiral 2-phenyl-glycinol, 1,5-dimethoxytetrahydrofuran, and benzotriazole, involves the diastereoselective substitution by Grignard reagents of a benzotriazolyl group in a crystalline intermediate obtained in high yield.
Chiral unsaturated beta-amino alcohols possessing a dialkylamino function cyclize in the presence of Pd(II) catalysts and reoxidants to afford enantiopure bicyclic oxazolidines with total regio- and stereocontrol. The scope and limitations of this transformation have been studied.