Sh. Chen et al., FIRST SYNTHESES OF NOVEL PACLITAXEL(TAXOL) ANALOGS MODIFIED AT THE C4-POSITION, Journal of organic chemistry, 59(21), 1994, pp. 6156-6158
A highly regiospecific method for the modification of paclitaxel at th
e C-4 position has been invented, as exemplified by the synthesis of t
he C-4 cyclopropyl ester of paclitaxel (4) and the C-4 benzoate of pac
litaxel (5).