CHONG, J. MICHAEL;MAR, EDUARDO K., TETRAHEDRON, 45,(1989) N4, C. 7709-7716
作者:CHONG, J. MICHAEL、MAR, EDUARDO K.
DOI:——
日期:——
Enantioselective syntheses of endo- and exo-brevicomin via α-alkoxystannanes
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