Multi-catalysis cascade reactions based on the methoxycarbonylketene platform: diversity-oriented synthesis of functionalized non-symmetrical malonates for agrochemicals and pharmaceuticals
作者:Dhevalapally B. Ramachary、Chintalapudi Venkaiah、Y. Vijayendar Reddy、Mamillapalli Kishor
DOI:10.1039/b901652j
日期:——
In this paper we describe new multi-catalysis cascade (MCC) reactions for the one-pot synthesis of highly functionalized non-symmetrical malonates. These metal-free reactions are either five-step (olefination/hydrogenation/alkylation/ketenization/esterification) or six-step (olefination/hydrogenation/alkylation/ketenization/esterification/alkylation), and employ aldehydes/ketones, Meldrum's acid, 1,4-dihydropyridine/o-phenylenediamine, diazomethane, alcohols and active ethylene/acetylenes, and involve iminium-, self-, self-, self- and base-catalysis, respectively. Many of the products have direct application in agricultural and pharmaceutical chemistry.
在本文中,我们描述了一种新的多重催化级联反应(MCC),用于一锅合成高度功能化的非对称马来酸酯。这些无金属催化反应分为五步(烯化/加氢/烷基化/酮化/酯化)或六步(烯化/加氢/烷基化/酮化/酯化/烷基化),涉及醛/酮、梅尔德伦酸、1,4-二氢吡啶/邻苯二胺、重氮甲烷、醇以及活性乙烯/炔烃,分别涉及亚胺、各自、自我、自我和碱催化。许多产品在农业和制药化学中具有直接应用。