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.
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.
Palladium-catalyzed Cross-coupling of Aryl Iodides with β-Trimethylsiloxy-α-diazoesters: A Novel Approach toward β-Keto-α-arylesters
作者:Zhibin Shu、Ji Zhang、Yan Zhang、Jianbo Wang
DOI:10.1246/cl.2011.1009
日期:2011.9.5
Palladium-catalyzed cross-coupling of β-trimethylsiloxy-α-diazoesters with aryliodides provides a new approach to β-keto-α-arylesters. It is shown that the β-trimethylsiloxy group can significantl...