Tertiary α-cyanoamines served as the precusors of iminiumions in the presence of titanium tetrachloride. Various intramolecular nucleophiles, olefinic and acetylenic, were found to produce cyclized products. The influences of ring sizes and substitutions on the double bonds were also investigated.
Synthesis of Pyrrolidines by Anionic Cyclization onto Allylic Ethers, Alkynes and Carboxylic Groups
作者:Iain Coldham、Maria M.S. Lang-Anderson、Richard E. Rathmell、David J. Snowden
DOI:10.1016/s0040-4039(97)01809-1
日期:1997.10
alpha-Amino-methylstannanes with pendent allylic ether, alkyne or carboxylic groups, can be converted, on treatment with butyllithium, to 3-vinyl-, 3-methylene- or 3-keto-pyrrolidines by anionic cyclization. (C) 1997 Elsevier Science Ltd.