作者:J.Michael Chong、Eduardo K. Mar
DOI:10.1016/s0040-4020(01)85787-2
日期:——
Enantioselective syntheses of (+)-endo-brevicomin (1) and (−)-exo-brevicomin (2) from the same enantiomerically-enriched α-alkoxyorganostannane are described. Reduction of 3 with (S)-BINAL-H gave (R)-4 in 98% ee. Transmetalation of (R)-4 with n-BuLi and reaction with N,N-dimethylamide 5 afforded α-alkoxyketone 6 with complete retention of configuration. Further manipulation of 16 efficiently provided
描述了从同一对映异构体富集的α-烷氧基有机锡链烷烃(+)-内-brevicomin(1)和(-)-exo-brevicomin(2)的对映选择性合成。用(S)-BINAL-H还原3得到98%ee的(R)-4。用正丁基锂对(R)-4进行重金属化并与N,N-二甲基酰胺5反应,得到具有完全保留构型的α-烷氧基酮6。对16的进一步操作有效地提供了(+)- 1或(-)- 2。