DBU-catalyzed condensation of acyldiazomethanes to aldehydes in water and a new approach to ethyl β-hydroxy α-arylacrylates
摘要:
DBU-catalyzed condensation of ethyl diazoacetate (EDA) with aldehydes in pure water afforded corresponding beta-hydroxy alpha-diazo carbonyl compounds. The beta-hydroxy group of the products was further converted into beta-siloxy group. The Rh(II)-catalyzed reaction of the beta-aryl beta-siloxy alpha-diazo carbonyl compounds gave 1,2-aryl shift products predominantly. The three-step transformation constitutes an efficient synthesis of ethyl beta-hydroxy alpha-arylacrylates. (c) 2006 Elsevier Ltd. All rights reserved.
申请人:Hubei Bio-Pharmaceutical Industrial Technological Institute Inc.
公开号:US20170313683A1
公开(公告)日:2017-11-02
Provided are a series of BTK inhibitors, and specifically disclosed are a compound, pharmaceutically acceptable salt thereof, tautomer thereof or prodrug thereof represented by formula (I), (II), (III) or (IV).
Acid-Catalyzed Reactions of Aromatic Aldehydes with Ethyl Diazoacetate: An Investigation on the Synthesis of 3-Hydroxy-2-arylacrylic Acid Ethyl Esters
作者:Matthew E. Dudley、Md. Monzur Morshed、Courtney L. Brennan、M. Shahidul Islam、M. Syarhabil Ahmad、Mary-Rose Atuu、Bryan Branstetter、M. Mahmun Hossain
DOI:10.1021/jo0489418
日期:2004.10.1
specifically HBF4·OEt2, are able to catalyze the reaction between aromatic aldehydes and ethyl diazoacetate to produce 3-hydroxy-2-arylacrylic acid ethylesters and 3-oxo-3-arylpropanoic acid ethylesters. Reactions catalyzed by the iron Lewis acid [(η5-C5H5)Fe+(CO)2(THF)]BF4- (i.e., 1) have the best yields and greatest ratio of 3-hydroxy-2-arylacrylic acid ethylester. The product distribution of 1 is not affected
Catalyst- and Substituent-Controlled Regio- and Stereoselective Synthesis of Indolyl Acrylates by Lewis-Acid-Catalyzed Direct Functionalization of 3-Formylindoles with Diazo Esters
作者:Sana Jamshaid、Shreedhar Devkota、Yong Rok Lee
DOI:10.1021/acs.orglett.1c00277
日期:2021.3.19
A facile and efficient In(OTf)3- and BF3·OEt2-catalyzed direct transformation of 3-formylindoles with diazo esters has been developed for synthesizing diverse and functionalized indolyl acrylates. This one-pot protocol furnishes various (Z)-α-hydroxy-β-indolyl acrylates, (E)-β-(2-alkoxy-2-oxoethoxy)-α-indolyl acrylates, and (Z)-3-hydroxy-2-indolyl acrylates by a catalyst- and substituent-controlled
Gold(<scp>i</scp>) “click” 1,2,3-triazolylidenes: synthesis, self-assembly and catalysis
作者:Kelly J. Kilpin、Ursula S. D. Paul、Ai-Lan Lee、James D. Crowley
DOI:10.1039/c0cc02185g
日期:——
Novel gold(I) âclickâ carbene(1,2,3-triazolylidene) complexes have been synthesised, characterised and exploited for the self-assembly of a metallomacrocycle and as precatalysts for gold(I)-catalysed reactions.
1,2-Migration in Rhodium(II) Carbene Transfer Reaction: Remarkable Steric Effect on Migratory Aptitude
作者:Fengping Xiao、Jianbo Wang
DOI:10.1021/jo0605391
日期:2006.7.1
been prepared in order to investigate the stericeffect in 1,2-migration reaction of rhodium(II) carbene. Through the investigation on the diazo decomposition of these compounds with Rh2(OAc)4, it was found that the stericeffect could dramatically influence the migratory aptitude. In many cases, the stericeffect could override the inherent electronic effect of the substituent.