1996 Volume 44 Issue 11 Pages 2186-2188
Conversion of the phthalide derivative 5 to the enediynes 6 and 11 are described. Treatment of 5 with 1, 8-diazabicyclo[5.4.0]undec-7-ene in hexamethylphosphoric triamide stereoselectively gives 6, which can be used as an efficient DNA-damaging biradical.