Eco-friendly and efficient catalyst-free synthesis of N-sulfonylimines from sulfonamides and aldehydes: crucial role of Al2O3 as a reusable dehydrating agent
Oxazolidine Synthesis by Complementary Stereospecific and Stereoconvergent Methods
作者:Michael B. Shaghafi、Robin E. Grote、Elizabeth R. Jarvo
DOI:10.1021/ol202068p
日期:2011.10.7
stereospecific and stereoconvergent reactions for enantioselective synthesis of 1,3-oxazolidines are reported. In the presence of a rhodium catalyst, reaction of enantioenriched butadiene monoxide with aryl imines is stereospecific (99% ee). Alternatively, the reaction of racemic butadiene monoxide, in the presence of a chiral palladium or nickel catalyst, provides an enantioselective synthesis of 1,3-oxazolidines
Johnson–Corey–Chaykovsky trifluoroethylidenation with (2,2,2-trifluoroethyl)diphenylsulfonium triflate proceeded smoothly to afford trifluoromethyl-epoxides, -cyclopropanes and -aziridines with excellent diastereoselectivity.