Facile Regioselective Synthesis of Functionalized Heterocycle-Tethered Spiro Compounds via an Intramolecular Electrophilic Ipso-Iodocyclization Process
作者:K. Majumdar、Tapas Ghosh、Pranab Shyam
DOI:10.1055/s-0031-1289526
日期:2011.11
A general, regioselective, and efficient intramolecular electrophilic ipso-iodocyclization of a series of N-alkyl-N-aryl phenylpropiolamides in the presence of I2 (molecular iodine) and NaHCO3 via 5-endo-dig mode of cyclization has been developed for the synthesis of hitherto unreported coumarin, quinolone, and pyrimidine-annelated heterocycliccompounds in excellent yields (84-92%). The development
A CuCl2-catalyzed dehydrogenative C-H activation leading to regioselective synthesis of coumarin, quinolone, and naphthalene fused heterocycles is reported. The reaction has been carried out in one pot under open atmosphere and it offers good to excellent yields of the cyclized products. (C) 2013 Elsevier Ltd. All rights reserved.