Efficient synthesis of 3-acyl-5-hydroxybenzofurans via copper(II) triflate-catalyzed cycloaddition of unactivated 1,4-benzoquinones with 1,3-dicarbonyl compounds
作者:Srinivasa Reddy Mothe、Dewi Susanti、Philip Wai Hong Chan
DOI:10.1016/j.tetlet.2010.02.066
日期:2010.4
A method to prepare a variety of substituted 3-acyl-5-hydroxybenzofurans efficiently that relies on copper(II) triflate-catalyzed cycloaddition of unactivated 1,4-benzoquinones with 1,3-dicarbonyl compounds is reported. The reaction was shown to be operationally straightforward and proceeds expediently under mild conditions to give the corresponding products in good to excellent yields (up to 95%) and with complete regioselectivity. (c) 2010 Elsevier Ltd. All rights reserved.
Thirupathaiah; Venkateshwar Rao; Ramanna, Oriental Journal of Chemistry, 2010, vol. 26, # 4, p. 1521 - 1524