反应详情

N-[(6R,7S)-2-Fluoro-6-methyl-8-oxo-9-(2,2,2-trifluoro-ethyl)-6,7,8,9-tetrahydro-5-oxa-9-aza-benzocyclohepten-7-yl]-2-(R or S)-hydroxy-2-methyl-N′-(3,3,3-trifluoro-propyl)-malonamide was obtained as mixture of epimers according to the procedures described for example 2b using racemic 2-hydroxy-2-methyl-N-(3,3,3-trifluoro-propyl)-malonamic acid and (6R,7S)-7-amino-2-fluoro-6-methyl-9-(2,2,2-trifluoro-ethyl)-6,7-dihydro-9H-5-oxa-9-aza-benzocyclohepten-8-one. The epimers were separated by chromatography on Chiralpak AD using ethanol/heptane 15:85 to yield (−)-N-[(6R,7S)-2-fluoro-6-methyl-8-oxo-9-(2,2,2-trifluoro-ethyl)-6,7,8,9-tetrahydro-5-oxa-9-aza-benzocyclohepten-7-yl]-2-(R or S)-hydroxy-2-methyl-N′-(3,3,3-trifluoro-propyl)-malonamide, entity A, MS m/e (%): 504.0 (M+H+, 100), as first eluting fraction, and (−)-N-[(6R,7S)-2-fluoro-6-methyl-8-oxo-9-(2,2,2-trifluoro-ethyl)-6,7,8,9-tetrahydro-5-oxa-9-aza-benzocyclohepten-7-yl]-2-(R or S)-hydroxy-2-methyl-N′-(3,3,3-trifluoro-propyl)-malonamide, entity B, as second eluting fraction, MS m/e (%): 504.0 (M+H+, 100).

1. customThe epimers were separated by chromatography on Chiralpak AD