2-Acetamido-4-methylthiazole-5-sulfonyl chloride → (S)-2-({(S)-6-(2-acetylamino-4-methyl-thiazole-5-sulfonyl)-3-[4-(3,4-dichloro-benzyloxy)-phenyl]-2-oxo-2,3,5,6,7,8-hexahydro-1H-4-oxa-1,6-diaza-anthracene-7-carbonyl}-amino)-3-(4'-cyano-biphenyl-4-yl)-propionic acid methyl ester

Participants

Reaction Steps

(S)-3-(4′-Cyano-biphenyl-4-yl)-2-({(S)-3-[4-(3,4-dichloro-benzyloxy)-phenyl]-2-oxo-2,3,5,6,7,8-hexahydro-1H-4-oxa-1,6-diaza-anthracene-7-carbonyl}-amino)-propionic acid methyl ester (760 mg) was reacted with 2-acetylamino-4-methyl-thiazole-5-sulfonyl chloride (381 mg) following general procedure E to furnish (S)-2-({(S)-6-(2-acetylamino-4-methyl-thiazole-5-sulfonyl)-3-[4-(3,4-dichloro-benzyloxy)-phenyl]-2-oxo-2,3,5,6,7,8-hexahydro-1H-4-oxa-1,6-diaza-anthracene-7-carbonyl}-amino)-3-(4′-cyano-biphenyl-4-yl)-propionic acid methyl ester (800 mg) as a mixture of diastereomers. The diastereomers were separated by flash chromatography over silica (DCM:EtOAc 9:1-6:4). The more polar diasteromer (LC-MS m/z 982, 12 mg) was hydrolyzed using the general procedure B to furnish title compound (8 mg, more polar diastereomer). LC-MS (m/z): 967.

Provenance & Evidence