Imidazol-5-ones as a substrate for [1,5]-hydride shift triggered cyclization
作者:Elvira R. Zaitseva、Alexander Yu. Smirnov、Ivan N. Myasnyanko、Konstantin S. Mineev、Anatolii I. Sokolov、Tatyana N. Volkhina、Andrey A. Mikhaylov、Nadezhda S. Baleeva、Mikhail S. Baranov
DOI:10.1039/d0nj05738j
日期:——
2-Dialkylamino-arylidene-imidazolones undergo intermolecular tandem [1,5]-hydride shift and cyclization to form spirocyclic tetrahydroquinoline derivatives under TiCl4 promotion. Different substitutions on each of the aryl, amino and imidazole fragments are tolerated, which results in 20+ examples and 25–95% yields.
Divergent synthesis of nitrogen heterocycles<i>via</i>H<sub>2</sub>O-mediated hydride transfer reactions
作者:Fangzhi Hu、Zhipeng Sun、Mengzhe Pan、Liang Wang、Lubin Xu、Xiong-Li Liu、Shuai-Shuai Li
DOI:10.1039/d3gc00166k
日期:——
of diverse nitrogenheterocycles from readily available feedstocks was developed by a hydride transferstrategy. A variety of 3-carboxyl and 3-acyl substituted tetrahydroquinolines and 3,4-dihydroquinolin-2(1H)-ones were obtained via cascade Knoevenagel condensation/[1,5]-hydride transfer/cyclization/hydrolysis/decarboxylation and cascade Knoevenagel condensation/[1,5]-hydride transfer/N-dealkylation/N-acylation
通过氢化物转移策略开发了H 2 O 促进的多种氮杂环化合物从现成原料的可控合成。通过级联Knoevenagel缩合/[ 1,5 ]-氢化物转移/环化/水解/脱羧和级联Knoevenagel获得了多种3-羧基和3-酰基取代的四氢喹啉和3,4-二氢喹啉-2(1 H) -ones分别为缩合/[1,5]-氢化物转移/ N-脱烷基化/ N-酰化过程。此外,还很好地介绍了方法学和机理研究的综合效用。