Active methylene compounds in a very effective approach to 3-substituted isobenzofuranones through tandem aldol/lactonization reactions
作者:Antonia Di Mola、Gianluca Croce、Vijaykumar More、Paolo De Caprariis、Rosanna Filosa、Antonio Massa
DOI:10.1016/j.tet.2012.05.079
日期:2012.8
In this article we describe a new accessible methodology for the synthesis of isobenzofuran-1(3H)-ones. In this process we exploited an effective, economic, useful and environmentally benign K2CO3 catalyzed, solvent-free one-pot tandem aldol-lactonization reaction between active methylene compounds and methyl 2-carboxy benzaldehyde. A particularly simple work-up and purification procedure are additional advantages addressed to a general green chemistry approach to this important class of heterocyclic compounds. (C) 2012 Elsevier Ltd. All rights reserved.
Rodionow; Tschuchina, Zhurnal Obshchei Khimii, 1956, vol. 26, p. 142,144; engl. Ausg. S. 143, 144
作者:Rodionow、Tschuchina
DOI:——
日期:——
Oxidative cyclization of dialdehydes with alcohols and 1,3-dicarbonyl compounds under Rh(III)/Cu(II) conditions
For the preparation of 3-alkoxyphthalides from phthalaldehydes and alcohols, a cyclization reaction in the presence of a rhodium(III) catalyst and copper(II) salt is reported. Cyclization of phthalaldehydes also occurs with 1,3-dicarbonyl compounds under similar conditions to produce 3-substituted phthalides in good yields. An acylrhodium(III) species might be a key intermediate in these cyclization