作者:Hardesh K. Maurya、Prema G. Vasudev、Atul Gupta
DOI:10.1039/c3ra41575a
日期:——
A regioselective synthesis of 2,6-diarylpyridines through base (sodium hydroxide in DMSO) catalyzed ring transformation of suitably functionalized 2H-pyran-2-ones with benzamide has been delineated. However, similar reaction of 2H-pyran-2-ones with benzamide using sodium hydroxide in absolute ethanol yielded highly congested delta keto esters with an active methylene centre, instead of 2,6-diarylpyridines.
通过碱(
二甲基亚砜中的
氢氧化钠)催化的环转变反应,从适当功能化的
2H-吡喃-2-酮与苯甲酰胺的区域选择性合成2,6-二芳基
吡啶已被详细阐述。然而,在无
水乙醇中使用
氢氧化钠作为催化剂,
2H-吡喃-2-酮与苯甲酰胺的类似反应产生了高度拥挤的δ-
酮酯,具有活性甲烯中心,而不是2,6-二芳基
吡啶。