Lewis Acid Catalyzed [1,3]-Sigmatropic Rearrangement of Vinyl Aziridines
作者:Matthew Brichacek、DongEun Lee、Jon T. Njardarson
DOI:10.1021/ol802123e
日期:2008.11.6
This paper details the copper-catalyzed ring expansion of vinyl aziridines to 3-pyrrolines. Broad substrate scope (24 examples) using tosyl- and phthalimide-protected vinyl aziridine substrates is observed. Cu(hfacac)2 was determined to be superior to all other catalysts tested.
Thiyl‐radical‐catalyzed cyclization reactions of N‐tosyl vinylaziridines and alkenes were developed as a new synthetic method for the generation of substituted pyrrolidines. The key to making this process accessible to a broad range of substrates is the use of a sterically demanding thiyl radical, which prevents the undesired degradation of the catalyst.