提出了在碱性条件下有效的,高区域选择性的将3-苯甲酰间苯二甲酸二甲酯二酯水解和酯交换成相应的羧酸单酯和混合酯(包括叔丁基酯)的方法。选择性由相邻的3-苯甲酰胺基部分的参与和溶剂的性质决定。在醇中,该反应仅发生在苯甲酰胺基官能团的邻位,在两个酯基的吡啶或乙腈中。通过在过氘代甲醇中的1 H NMR研究获得了对机理途径的见解。
Cycloaddition of Styrenes as Phenylacetylene Substitutes on 2H-Pyran-2-ones and the Consequent Metal-Free Dehydrogenation: Case Study of Boscalid Derivatives
incorporates the Diels–Alder reaction of 3-acylamino-2H-pyran-2-ones with styrenes, followed by an efficient dehydrogenation step. The latter can be achieved either by the use of chloranil as the oxidant (under microwave irradiation) or by the application of activated charcoal Darco KB acting as a dehydrogenation catalyst (conventional heating). A novel use of styrenes as synthetic equivalents of phenylacetylenes
Comparison of the reaction pathways and intermediate products of a microwave-assisted and high-pressure-promoted cycloaddition of vinyl-moiety-containing dienophiles on 2H-pyran-2-ones
A comparative study of the reaction pathway of the cycloaddition of various vinyl-containing dienophiles on a set of substituted 3-acylamino-2H-pyran-2-ones under microwave-assisted and high-pressure conditions is presented. In the course of the reaction both the intermediate products, i.e., the 2-oxabicyclo[2.2.2]oct-5-ene (the exo/endo selectivity depended upon the dienophile) and the alkoxycyclohexadiene systems, were isolated and comprehensively characterized; this included X-ray diffraction analyses. The role of the base (DABCO) as an organocatalyst was further elucidated. (C) 2011 Elsevier Ltd. All rights reserved.
Regioselective Hydrolysis and Transesterification of Dimethyl 3-Benzamidophthalates Assisted by a Neighboring Amide Group
An efficient, highly regioselective hydrolysis and transesterification of dimethyl 3-benzamidophthalates into the corresponding carboxylic acid monoesters and mixed esters (including tert-butyl esters) under basic conditions is presented. The selectivity is governed by the neighboring 3-benzamido moiety’s participation and by the nature of the solvent. In alcohols the reaction occurred exclusively
提出了在碱性条件下有效的,高区域选择性的将3-苯甲酰间苯二甲酸二甲酯二酯水解和酯交换成相应的羧酸单酯和混合酯(包括叔丁基酯)的方法。选择性由相邻的3-苯甲酰胺基部分的参与和溶剂的性质决定。在醇中,该反应仅发生在苯甲酰胺基官能团的邻位,在两个酯基的吡啶或乙腈中。通过在过氘代甲醇中的1 H NMR研究获得了对机理途径的见解。