Synthesis of 2-amino-3-cyano-4H-chromen-4-ylphosphonates and 2-amino-4H-chromenes catalyzed by tetramethylguanidine
作者:Reddi Mohan Naidu Kalla、Seong Jin Byeon、Min Seon Heo、Il Kim
DOI:10.1016/j.tet.2013.10.052
日期:2013.12
Synthesis of 2-amino-4H-chromen-4-ylphosphonates and 2-amino-4H-chromenes has been accomplished by the reaction of salicylaldehyde, malononitrile, dialkyl/diphenylphosphites catalyzed by 1,1,3,3-tetramethylguanidine (TMG) under neat conditions at room temperature. The applicability of catalytic TMG for the synthesis of 2-amino-4H-chromenes also has been described. The mild reaction conditions, simple work-up procedure, and use of TMG as an inexpensive catalyst provides an economical protocol for the preparation of important phosphorus-containing compounds. (C) 2013 Elsevier Ltd. All rights reserved.
Solvent- and Catalyst-free Synthesis of (2-Amino-3-cyano-4H-chromen-4-yl) Phosphonates
protocol is a multicomponent reaction (MCR). A number of MCRs have been developed for the preparation of libraries of privileged structures.10–16 Amongst three-component syntheses, the generation of (2-amino-3-cyano-4H-chromen-4-yl) phosphonates is considered a prominent protocol owing to the incorporation of a phosphorus atom in the molecule.17,18 A number of reactions catalyzed by Brønsted base,19–21