Unexpected Hydrobromic Acid??Catalyzed C C Bond??Forming Reactions and Facile Synthesis of Coumarins and Benzofurans Based on Ketene Dithioacetals

…, M Wang, Y Liu, L Wang, J Liu, Q Liu

Index: Yuan, Hongjuan; Wang, Mang; Liu, Yingjie; Wang, Lili; Liu, Jun; Liu, Qun Chemistry - A European Journal, 2010 , vol. 16, # 45 p. 13450 - 13457

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Citation Number: 35

Abstract

Abstract Hydrobromic acid was found to be a unique catalyst in C [BOND] C bond-forming reactions with ketene dithioacetals. Distinctly different from other acids (including Lewis and Brønsted acids), the remarkable catalytic performance of hydrobromic acid in catalytic amounts was observed in the “acid”-catalyzed reactions of readily available functionalized ketene dithioacetals 1 with various electrophiles. Under the catalysis of 0.1 equivalents of ...