diastereo- and enantiocontrolled preparation of the conformationally restricted cis-β-azidocyclopropane esters have been developed. The Rh2(S-DOSP)4 was found to be an efficient catalyst in hexane for the cyclopropanation of azido alkenes with diazo esters, and 19 cis-β-azidocyclopropane esters were prepared in excellent yields. The value of the diastereomer ratio was up to 99:1, and the enantiomeric
已经开发了构象受限的顺式-β-
叠氮基
环丙烷酯的非对映体和对映体控制的制备物。发现Rh 2(S -
DOSP)4是己烷中重氮
叠氮基烯烃
环丙烷化的有效催化剂,并以优异的收率制备了19种顺式-β-
叠氮基
环丙烷酯。非对映异构体比率的值高达99:1,对映异构体过量高达95%。此外,通过X射线分析确认了相对和绝对构型。