Total Synthesis of Candicanoside A, a Rearranged Cholestane Disaccharide, and Its 4″-<i>O</i>-(<i>p</i>-Methoxybenzoate) Congener
作者:Pingping Tang、Biao Yu
DOI:10.1002/ejoc.200800879
日期:2009.1
Candicanoside A (1) and its4″-O-(p-methoxybenzoate) derivative 2 are congeners of the novel 24(2322)abeo-cholestane glycosides that occur in the genus Ornithogalum indigenous to Southern Africa and have remarkable cytostatic activities. These two saponins have been synthesized starting from dehydroisoandrosterone, D-glucose, and L-rhamnose in 37 and 44 steps, respectively. The reaction protocols feature