Semisynthesis of DB-67 and other silatecans from camptothecin by thiol-promoted addition of silyl radicals
作者:W Du
DOI:10.1016/s0968-0896(02)00437-6
日期:2003.2.6
Thiol- or acid-promoted additions of silylradicals to camptothecin are reported. At 105 degrees C, mixtures of 7-silyl (favored) and 12-silyl camptothecins are formed alongside substantial amounts of recovered camptothecin. At 160 degrees C, 12-silyl isomers are formed preferentially, but the total mass balance is substantially reduced. The silylradicaladdition is featured in short semi-syntheses