Facile and Efficient Synthesis of Benzoxazoles and Benzimidazoles: The Application of Hantzsch Ester 1, 4??Dihydropyridines in Reductive Cyclization Reactions

…, QY Meng, J Li, XX Shen, Z Liu, B Zhou…

Index: Xing, Rui-Guang; Li, Ya-Nan; Liu, Qiang; Meng, Qing-Yuan; Li, Jing; Shen, Xiao-Xia; Liu, Zhengang; Zhou, Bo; Yao, Xiaojun; Liu, Zhong-Li European Journal of Organic Chemistry, 2010 , # 34 p. 6627 - 6632

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Citation Number: 14

Abstract

Abstract Both benzoxazole and benzimidazole are common heterocyclic scaffolds in biologically active and medicinally significant compounds. Reductive cyclization of ortho- substituted nitrobenzene derivatives provides an attractive route to benzoxazole or benzimidazole ring formation. Unfortunately, only a few synthetic methods by reductive cyclization ofortho-nitro compounds have been reported and the yields are rather low. In ...