A facile synthesis of 7, 8-di aryl coumarino and flavano benzo-thiophenes

GVP Chandramouli, B Prasanna…

Index: Chandramouli; Prasanna; Naveen Kumar; Vijayakumar Reddy Phosphorus, Sulfur and Silicon and Related Elements, 2002 , vol. 177, # 2 p. 511 - 522

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Citation Number: 3

Abstract

The key step for the synthesis of 7-hydroxy 2, 3-diarylsubstituted benzothiophenes 5a-f, by starting from substituted 2-aryl-2-((2-methoxy phenyl) thio) acetophenones 3a-f as an intermediate, consists of a Friedel-Crafts cyclization followed by demethylation by Lewis acids like BF 3 OEt 2 and AlCl 3 in DCM.