Efficient One‐Pot Synthesis of Hydroxyflavanones by Cyclization andO‐Demethylation of Methoxychalcones
摘要:
An efficient one-pot method for the synthesis of hydroxyflavanones is described. Methoxychalcones are treated with 36% HBr to afford cyclization and regioselective O-demethylation products (2a-i) while cyclization and complete O-demethylation products (3a-e) are obtained in the presence of 45% HI.