Bronsted acid-catalyzed intramolecular hydroamination of protected alkenylamines. Synthesis of pyrrolidines and piperidines

Bronsted acid-catalyzed intramolecular hydroamination of protected alkenylamines.   	Synthesis of pyrrolidines and piperidines

Org. Lett.  20024,  1471-1474.

The cyclization of aminoalkenes bearing an electron-withdrawing group on the nitrogen atom was catalyzed by triflic or sulfuric acid in toluene. Pyrrolidines and piperidines were formed in excellent yields. N-Phenylanilides also underwent cyclization to form γ-lactams. Read more on publisher's site.