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。
Direct dyes and composition comprising the dyes
申请人:Kao Germany GmbH
公开号:EP3037485A1
公开(公告)日:2016-06-29
The present invention relates to novel direct dyes and compositions comprising them for dyeing keratin fibers especially human hair. The novel dyes of the present invention have benzothiophene structure providing intensive and homogeneous dyeing on keratin fibers, especially human hair.
Regioselective formylation of 1,3-disubstituted benzenes through in situ lithiation
作者:Le Wang、Yan Wang、Fangxu Guo、Yue Zheng、Pinaki S. Bhadury、Zhihua Sun
DOI:10.1016/j.tetlet.2013.08.098
日期:2013.11
A facile method of regioselective formylation of disubstituted benzene via in situ deprotonation/metalation using n-BuLi/TMEDA/DIPA has been developed. Effect of different electron withdrawing and electron donating substituents in 1,3-interrelated aromatic system was studied; the metalation mostly occurred at the 2-position to afford the desired products in high yields. (c) 2013 Elsevier Ltd. All rights reserved.