A breath test using [1-(13)C]glycocholic acid as a substrate is a potential diagnostic method for small intestinal bacterial overgrowth syndrome. [1-(13)C]Glycocholic acid has been thus synthesized in an excellent yield from ethyl [1-(13)C]glycinate hydrochloride in a one-pot reaction. This method is suitable for the preparation of the labeled compound on a laboratory scale, which helps to perform extensive clinical studies of the breath test.
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