(S)-2-(Methylamino)-2-oxo-1-phenylethyl 4-methylbenzenesulfonate → 3-Ethyl-7-(methylcarbamoyl-phenyl-methyl)-8-[2-(4-trifluoromethyl-phenyl)-ethyl]-5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine-1-carboxylic acid methylamide

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Prepared by reaction of 3-ethyl-8-[2-(4-trifluoromethyl-phenyl)-ethyl]-5,6,7,8-tetrahydro-imidazo[1,5-a]pyrazine-1-carboxylic acid methylamide (22 mg; 0.057 mmol) with toluene-4-sulfonic acid (S)-methylcarbamoyl-phenyl-methyl ester. Purification by preparative HPLC afforded the mixture of 2 diastereoisomers. LC-MS: tR=0.86 min., [M+H]+=528.45 g/mol.

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