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Glycine and taurine conjugates of 5beta-cholanic acids have been synthesized using improved procedures based on the peptide coupling reagent, N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline. The conjugates are obtained in chromatographically pure form in yields higher than 90%. The use of this procedure in the large scale preparation of cholyl1,2-13C2glycine is described.
Tserng et al. (Sun,) studied this question.