Sh. Chen et al., SERENDIPITOUS SYNTHESIS OF A CYCLOPROPANE-CONTAINING TAXOL ANALOG VIAANCHIMERIC PARTICIPATION OF AN UNACTIVATED ANGULAR METHYL-GROUP, Journal of organic chemistry, 58(17), 1993, pp. 4520-4521
Treatment of a 7-epi taxol derivative with DAST in dichloromethane led
to an unexpected reaction involving participation of the C-19 methyl
group and clean formation of a cyclopropane ring.