据报道,使用由碘代苯和硝基乙酸甲酯原位生成的苯基碘鎓叶立德,对烯烃进行了高度对映选择性(高达 97.5% ee)和非对映选择性(95:5 dr 反式/顺式)Cu(I)催化的烯烃环丙烷化反应。环丙烷化反应对多种烯烃具有高对映选择性,反应在室温下进行。1-硝基环丙基酯是通用的结构单元,可分别通过两步和三步从市售产品中获得相应的环丙烷氨基酯和氨基环丙烷。
Catalytic asymmetric synthesis of nitrocyclopropane carboxylates
作者:Benoît Moreau、Dino Alberico、Vincent N.G. Lindsay、André B. Charette
DOI:10.1016/j.tet.2011.05.113
日期:2012.4
A Cu(I)-catalyzed asymmetric cyclopropanation of alkenes with an iodonium ylide has been developed. The copper source, hypervalent iodine source, solvent, and additives all have a significant effect on the yields and enantioselectivities. High enantioselectivity (up to 99:1 er) and diastereoselectivity (95:5 dr trans/cis) were achieved for a wide range of alkenes. Conditions were developed to convert