| 摘要 |
New derivatives of chenodeoxycholic, ursodeoxy cholic, cholic and ursocholic acids, bearing a methyl group in the side chain in an alfa position to the carboxylic group, the corresponding nor- and di-nor- derivatives, and the corresponding conjugates with taurine and glycine, are described. The compounds of the invention are prepared by methylation of the esters with methyl iodide in the presence of lithium-dialkylamides.
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