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- W2068064480 abstract "12-Carboxamido- and 12-carboxyl-11-spirostenes were synthesized from the corresponding 12-iodo-11-ene derivative in palladium-catalyzed carbonylation reactions under mild reaction conditions. The synthesis of the iodo-alkene substrate is based on the transformation of the 12-keto derivative (hecogenin) to hydrazone, which was treated with iodine in the presence of a base (1,1,3,3-tetramethyl guanidine). While various 12-carboxamides were synthesized in moderate to high yields by using simple alkyl/arylamines or amino acid methylesters as N-nucleophiles, low yields can be achieved with alcohols as O-nucleophiles. The homogeneous carbonylation reactions tolerate the 3-hydroxy substituent and the spiroacetal moiety." @default.
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- W2068064480 date "2006-10-01" @default.
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- W2068064480 title "Facile synthesis of 12-carboxamido-11-spirostenes via palladium-catalyzed carbonylation reactions" @default.
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- W2068064480 doi "https://doi.org/10.1016/j.steroids.2006.05.019" @default.
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