Synthesis of pyrrolidines by anionic cyclization onto allylic ethers, alkynes and carboxylic groups

Article abstract of DOI:10.1016/S0040-4039(97)01809-1

α-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.