(Chemical Equation Presented) The highly oxygenated steroid ouabagenin (1b) and its glycoside ouabain (1a) were prepared by a strategy based on a polyanionic cyclization. Starting building blocks A and B were combined to give the key intermediate C and transformed into 1b in 27 steps. Finally, ouabagenin (1b) was converted into ouabain (1a) in six steps (see scheme).
Zhang, Hongxing,Sridhar Reddy, Maddi,Phoenix, Serge,Deslongchamps, Pierre
p. 1272 - 1275
(2008/12/22)
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