New strategy for the synthesis of 3-substituted prolines
摘要:
Ring formation involving a Sere trig cyclization between a zinc enolate and a non activated double bond led to cis diastereoisomer of 3-substituted prolines. This cyclization was achieved with transfer of chirality onto the C-2 carbon when nitrogen was protected by an alpha-methylbenzyl group. Reprotonation of the lithium enolate of cis derivative yielded the trans diastereoisomer. Copyright (C) 1996 Published by Elsevier Science Ltd