作者:Louis H.P. Meuer、C.G. Johannes、Van Niel、Upendra K.Pandit
DOI:10.1016/s0040-4020(01)91269-4
日期:1984.1
2-pyridyl ketones (5-c) and ethyl cyclopropylmethlenepyruvate (14) have been subjected to reduction by l,4-dihydropyridines [3,5-diethoxycarbonyl-2,6-dimethyl-l,4-dihydropyridine (2) and/or 1-benzyl-1,4-dihydronicotinamide (7)]in the presence of magnesium ions, and by tin hydrides. The reactions with 1,4-dihydropyridines do not involve cleavage of the three-membered ring in the reduction step. The
N-(环丙基亚甲基)苯胺(1a-c),环丙基2-吡啶基酮(5-c)和环丙基甲基苯丙酮酸乙酯(14)已被1,4-二氢吡啶[3,5-二乙氧基羰基-2,6-取代二甲基-1,4-二氢吡啶(2)和/或1-苄基-1,4-二氢烟碱酰胺(7)]在镁离子存在下并通过氢化锡。与1,4-二氢吡啶的反应在还原步骤中不涉及三元环的裂解。从2-吡啶基2,2-二甲基环丙基酮(5b)中观察到的无环产物是在羰基官能团降低之前环裂解的结果。相反,减少1a-c和5-c被氢化锡导致环丙烷部分已开环的产物。这些发现支持了使用NADH模型进行还原的氢化物转移机制。