A novel and efficient synthesis of 3,3-disubstituted indol-2-ones via Passerini three-component reactions in the presence of 4Å molecular sieves
摘要:
The Passerini coupling of cyclohexylisocyanide with isatins and carboxylic acids in the presence of 4 angstrom molecular sieves is described. This process offers a highly efficient and atom-economic access to 3-acyloxy-3-carboxamido-1,3-dihydro-2H-indol-2-ones in high to excellent yields. (C) 2012 Elsevier Ltd. All rights reserved.