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