A Convenient Preparation of 2-Aroyl-3,3-bis(alkylsulfanyl)acrylaldehydes and Their Application in the Synthesis of 5-Aroyl-2-oxo-1,2-dihydro-2-pyridinecarbonitriles
作者:Chittoorthekkathil V. Asokan、Engoor R. Anabha
DOI:10.1055/s-2005-918491
日期:——
The reaction of aroylketene dithioacetals 1 with Vilsmeier-Haack reagent, prepared from POCl3 and DMF, under mild conditions gave 2-aroyl-3,3-bis(alkylsulfanyl)acrylaldehydes 2 in excellent yields. Cyclization of 2-[2-aroyl-3,3-bis(methylsulfanyl)-2-propylidene]malononitriles 3, derived from 2 and malononitrile, in the presence of concentrated hydrochloric acid in tertiary butanol afforded 2-pyridone derivatives 4.
Friedel–Crafts Coupling of Electron-Deficient Benzoylacetones Tuned by Remote Electronic Effects
作者:Hongmei Luo、Ling Pan、Xianxiu Xu、Qun Liu
DOI:10.1021/acs.joc.5b01371
日期:2015.8.21
electrophilic substitutions and remains a major challenge. Herein, the synthesis of naphthoquinones and 1,3-indandiones, bearing two acyl groups at positions ortho to each other on a benzene ring, are demonstrated by means of copper-catalyzed intramolecular aerobic oxidative acylation of benzoylacetone derivative precursors. This unusual Friedel–Crafts reaction reveals a new activation mode for the