Synthesis and cytotoxic activity of some 17-picolyl and 17-picolinylidene androstane derivatives
作者:Evgenija A. Djurendić、Jovana J. Ajduković、Marija N. Sakač、János J. Csanádi、Vesna V. Kojić、Gordana M. Bogdanović、Katarina M. Penov Gaši
DOI:10.1016/j.ejmech.2012.06.030
日期:2012.8
eliminationfrom 7 or 9 affords AB conjugated derivatives 8 and 10. Oppenauer oxidation of 1 and 2 yields 4-en-3-one derivatives 11 and 12, which, with H2O2 in 4 M NaOH, affords 4α,5α and 4β,5β-epoxides 13, 14, 16 and 17. New 4-methoxy-3-keto derivatives 15 and 18 were obtained from 13 and 14, or, with methanol in 4 M NaOH, from 16 and 17. Reduction of 11 with NaBH4 gives 22, which was then acetylated