Microwave-Assisted Condensation Reactions of Acetophenone Derivatives and Activated Methylene Compounds with Aldehydes Catalyzed by Boric Acid under Solvent-Free Conditions
We here disclosed a new protocol for the condensation of acetophenone derivatives and active methylene compounds with aldehydes in the presence of boricacid under microwave conditions. Implementation of the reaction is simple, healthy and environmentally friendly owing to the use of a non-toxic catalyst coupled to a solvent-free procedure. A large variety of known or novel compounds have thus been
Solution phase synthesis of a spiro[pyrrolidine-2,3′-oxindole] library via a three component 1,3-dipolar cycloaddition reaction
作者:Demosthenes Fokas、William J. Ryan、David S. Casebier、David L. Coffen
DOI:10.1016/s0040-4039(98)00234-2
日期:1998.4
A combinatorial library of 26,500 spiro[pyrrolidine-2,3′-oxindoles] was prepared in a single-compound format by a facile intermolecular 1,3-dipolarcycloaddition. An azomethine ylide, generated by the decarboxylative condensation of an isatin 1 with an α-amino acid 2, was trapped by a trans-chalcone3 to afford heterocycles of the general structure 4. The regio- and stereochemistry of a representative