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The (25R)- and (25S)-epimers of C 27 3α,7α,12α-trihydroxy-5α-cholestan-27-oic acid as well as their corresponding N-acylamidate conjugates with glycine or taurine were prepared starting from cholic acid in 14 steps. The principal reactions involved were (1) reduction of a key intermediary C 24 allo-cholic acid performate with NaBH 4 /triethylamine/ethyl chloroformate, (2) iodination...
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