Selective reduction. Reaction of 3,4-dicarbomethoxyquinoline with lithium aluminium hydride. Steric effect.
作者:A. Godard、G. Quéguiner
DOI:10.1016/s0040-4039(01)92350-0
日期:1981.1
The selective reduction of 3,4-dicarbomethoxyquinoline by lithium aluminium hydride at low temperature affords only the unexpected 3-formyl 4-carbomethoxy quinoline. The difficulty of reduction of the usually more reactive 4-ester group can be explained by a steric hindrance by the H5, peri proton on one side and by the 3-ester group on the other side.
在低温下通过氢化锂铝选择性还原3,4-二苯甲氧基喹啉仅提供了出乎意料的3-甲酰基4-羰基甲氧基喹啉。通常,反应性更高的4-酯基团还原的困难可以通过H 5,旁边的质子在一侧和在另一侧的3-酯基团的空间位阻来解释。