反应详情

In analogy to example 36 step B) the desired racemic mixture of (2S,4S)-1-(toluene-4-sulfonyl)-4-(4-trifluoromethoxy-phenylcarbamoyl)-piperidine-2-carboxylic acid and (2R,4R)-1-(toluene-4-sulfonyl)-4-(4-trifluoromethoxy-phenylcarbamoyl)-piperidine-2-carboxylic acid (0.22 g) was obtained from the reaction of a racemic mixture of (2S,4S)-1-(toluene-4-sulfonyl)-piperidine-2,4-dicarboxylic acid 4-methyl ester and (2R,4R)-1-(toluene-4-sulfonyl)-piperidine-2,4-dicarboxylic acid 4-methyl ester (0.392 g) with 4-trifluoromethoxy-aniline (0.264 g) and dimethylaluminium chloride in heptane (0.9 molar, 2.93 ml) as a brown solid. MS (ESI): 487.2 (MH+).