Palladium-catalyzed aromatization of β-bromovinyl aldehydes with alkenes
作者:Chan Sik Cho、Daksha B. Patel、Sang Chul Shim
DOI:10.1016/j.tet.2005.08.001
日期:2005.10
β-Bromovinylaldehydes, which are readily available from ketones and PBr3/DMF/CHCl3, are aromatized with suitably electron withdrawing group substituted alkenes in THF at 125 °C in the presence of a catalytic amount of a palladiumcatalyst along with a base.
A Convenient Synthesis of α-Functional Alkyl Vinyl Ketones
作者:T. Ben Ayed、H. Amri
DOI:10.1080/00397919508011455
日期:1995.12
Abstract Reaction of 2-functional alkyl-1,3-diketones with 30% aqueous formaldehyde using aqueous 6-10M potassium carbonate solution as base, afforded a-functional alkylvinylketones in good yields.
Cobalt catalysed hydro-sulfenylation of Michael acceptors
作者:Christopher L. Friend、Nigel S. Simpkins、Michael Anson、Mario E.C. Polywka
DOI:10.1016/s0040-4020(98)83016-0
日期:1998.3
The reaction of certain types of Michael accepters, limited to those having methylene groups, with a mixture of diphenyl disulfide and phenyl silane, under the influence of 10% of the cobalt catalyst, Co(eobe) 3, results in the formation of hydro-sulfenylated products, such as alpha-phenylthio carbonyl compounds, in moderate to good yields. The process involves intermediates having radical character, judging by the 5-exo-trig cyclisation product 21 observed in the reaction of alpha,beta-unsaturated ester 20 having a suitable unsaturated sidechain. (C) 1998 Elsevier Science Ltd. All rights reserved.