Chemoselective oxidative hydrolysis of EWG protected α-arylamino vinyl bromides to α-arylamino-α′-bromoacetones
摘要:
Vinyl bromides bearing an arylamino group in the vicinal position are chemoselectively transformed into interesting alpha-arylamino-alpha'-bromoacetones through a straightforward oxidative hydrolysis promoted by calcium hypobromite under mild acidic conditions. Significantly, this particular combination [vinyl bromides and Ca(BrO)(2)] avoids bromination at both the aromatic ring and activated positions in groups substituting the amine nitrogen. The usefulness of this class of brominated ketones has been shown in a Wittig homologation. (c) 2013 Elsevier Ltd. All rights reserved.
Chemoselective oxidative hydrolysis of EWG protected α-arylamino vinyl bromides to α-arylamino-α′-bromoacetones
摘要:
Vinyl bromides bearing an arylamino group in the vicinal position are chemoselectively transformed into interesting alpha-arylamino-alpha'-bromoacetones through a straightforward oxidative hydrolysis promoted by calcium hypobromite under mild acidic conditions. Significantly, this particular combination [vinyl bromides and Ca(BrO)(2)] avoids bromination at both the aromatic ring and activated positions in groups substituting the amine nitrogen. The usefulness of this class of brominated ketones has been shown in a Wittig homologation. (c) 2013 Elsevier Ltd. All rights reserved.
Benzylarylation of <i>N</i>-Allyl Anilines: Synthesis of Benzylated Indolines
作者:Wenzhong Huang、Xiulan Li、Xuemei Song、Qing Luo、Yanping Li、Ying Dong、Deqiang Liang、Baoling Wang
DOI:10.1021/acs.joc.9b00237
日期:2019.5.17
functionalization of methyl arenes across unactivated alkenes is presented. In the presence of MnCl2·4H2O and di-tert-butyl peroxide, N-allyl anilines underwent benzylation/cyclization cascade to give benzylated indolines, which are a previously unmet synthetic goal. This protocol features simple operation, broad substrate scope, and great exo selectivity.
Synthesis of N-Heterocycles by Dehydrogenative Annulation of N-Allyl Amides with 1,3-Dicarbonyl Compounds
作者:Zheng-Jian Wu、Shi-Rui Li、Hai-Chao Xu
DOI:10.1002/anie.201807683
日期:2018.10.22
construct cyclicstructures. Reported herein is an unprecedented synthesis of pyrrolidine and tetrahydropyridine derivatives through electrochemical dehydrogenative annulation of N‐allyl amides with 1,3‐dicarbonyl compounds. The electrolytic method employs an organic redox catalyst, which obviates the need for oxidizing reagents and transition‐metal catalysts. In these reactions, the N‐allyl amides serve
Chemoselective oxidative hydrolysis of EWG protected α-arylamino vinyl bromides to α-arylamino-α′-bromoacetones
作者:Vittorio Pace、Laura Castoldi、María J. Hernáiz、Andrés R. Alcántara、Wolfgang Holzer
DOI:10.1016/j.tetlet.2013.05.118
日期:2013.8
Vinyl bromides bearing an arylamino group in the vicinal position are chemoselectively transformed into interesting alpha-arylamino-alpha'-bromoacetones through a straightforward oxidative hydrolysis promoted by calcium hypobromite under mild acidic conditions. Significantly, this particular combination [vinyl bromides and Ca(BrO)(2)] avoids bromination at both the aromatic ring and activated positions in groups substituting the amine nitrogen. The usefulness of this class of brominated ketones has been shown in a Wittig homologation. (c) 2013 Elsevier Ltd. All rights reserved.