Consideration of molecular arrangements in regio- and enantioselective reduction of an NAD model compound controlled by carbonyl oxygen orientation
作者:Yuji Mikata、Shiho Aida、Yoko Inaba、Shigenobu Yano
DOI:10.1039/b710780c
日期:——
low enantioselectivity, whereas sodium borohydride promotes 1,2-reduction, affording 3-piperidinylcarbonyl-1,2,4-trimethyl-1,2-dihydroquinoline () as the sole product in a moderate enantioselectivity. When 1 was reduced by the chiral NADH model compound, 2,4-dimethyl-3-(N-alpha-methylbenzylcarbamoyl)-1-propyl-1,4-dihydropyridine (Me(2)PNPH (4)), the regioselectivity and enantioselectivity of the reaction
具有轴向手性的NAD模型化合物相对于C(3)(喹啉鎓)-C(羰基)键,3-哌啶基羰基-1,2,4-三甲基喹啉鎓离子的还原反应的区域和对映选择性(1),描述了通过使用几种还原剂。1与亚硫酸氢钠反应可得到1,4-还原产物,3-哌啶基羰基-1,2,4-三甲基-1,4-二氢喹啉(),对映选择性低,而硼氢化钠可促进1,2-还原,得到作为唯一产物的3-哌啶基羰基-1,2,4-三甲基-1,2-二氢喹啉()具有中等对映选择性。当1被手性NADH模型化合物还原时,2,4-二甲基-3-(N-α-甲基苄基氨基甲酰基)-1-丙基-1,4-二氢吡啶(Me(2)PNPH(4)),1和4的立体化学显着改变了反应的区域选择性和对映选择性。非手性NADH模型化合物1-丙基-1,4-二氢烟酰胺(PNAH(5))表现出较高的区域选择性和对映选择性。产物的选择性反映了反应过渡态中分子排列的变化,并揭示了控制反应中分子排列的参数的相对重要性。