Fr. Blase et K. Banerjee, AN ULLMANN ETHER REACTION INVOLVING AN ALKYNYL SUBSTRATE - A CONVERGENT ROUTE TO A COMBRETASTATIN INTERMEDIATE, Synthetic communications, 25(20), 1995, pp. 3187-3197
We found that we could employ a disubstituted alkynyl halide in an Ull
mann ether reaction to produce the cis-alkene intermediate 3 of the co
mbretastatin natural products.