A straightforward synthesis of enantiopure 2-cyano azetidines from β-amino alcohols
作者:Claude Agami、François Couty、Gwilherm Evano
DOI:10.1016/s0957-4166(02)00076-9
日期:2002.3
Enantiopure 2-cyano azetidines were prepared in high yields from β-amino alcohols. This synthesis was shown to be general and is based on two important steps: (i) chlorination of a N-cyanomethylated β-amino alcohol and (ii) a 4-exo-trig ring closure through the alkylation of a lithiated α-amino nitrile. The former step is stereoselective when ephedrine-derived β-amino alcohols are used. In the case