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.
Short Enantioselective Syntheses of <i>trans</i>-5-Alkylprolines from New Functionalized Amino Alcohols
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.