A. Werner et W. Friedrichsen, SYNTHESIS OF A 6H-BENZOFURO[3,2-C][1]BENZOPYRAN-6-ONE A NEW APPLICATION OF THE HURTLEY REACTION, Synthetic communications, 23(21), 1993, pp. 2973-2975
A copper(I)bromide promoted substitution of 2-bromobenzofuran-3- carbo
xylic acid (2b) with dimedone and subsequent lactonization offers a ne
w route to a modified coumestane ring system.