作者:François Couty、François Durrat、Damien Prim
DOI:10.1016/s0040-4039(03)01227-9
日期:2003.7
α-hydroxyalkyl azetidines, prepared in a few steps from enantiopure β-amino alcohols, are chlorinated or transformed into methanesulfonyloxymethyl derivatives in good yields. Heating of these compounds in chloroform or dimethylformamide induces a stereospecific ring enlargement to give 3-chloro or 3-methanesulfonyloxy pyrrolidines. The ease of this rearrangement depends on the nature of the migrating
由对映体纯的β-氨基醇经几个步骤制得的立体定义的α-羟烷基氮杂环丁烷被氯化或以良好的产率转化为甲磺酰氧基甲基衍生物。在氯仿或二甲基甲酰胺中加热这些化合物可引起立体有择的环扩大,从而产生3-氯或3-甲磺酰氧基吡咯烷。这种重排的容易性取决于所述迁移基团的性质(CL -或MSO - ),类起始醇的和起始材料的相对立体化学的(初级或次级)。