7-chloro-1-[2-methyl-4-(2-methylbenzoylamino)-benzoyl]-2,3,4,5-tetrahydro-1H-benzo[b]azepin-5-yl 3-[2-(bis-benzyloxy-phosphoryloxy)-4,6-dimethyl-phenyl]-3-methyl-butyrate → 7-chloro-1-[2-methyl-4-(2-methyl-benzoylamino)-benzoyl]-2,3,4,5-tetrahydro-1H-benzo[b]azepin-5-yl 3-(2,4-dimethyl-6-phosphonooxy-phenyl)-3-methyl-butyrate

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A mixture of 7-chloro-1-[2-methyl-4-(2-methylbenzoylamino)-benzoyl]-2,3,4,5-tetrahydro-1H-benzo[b]azepin-5-yl 3-[2-(bis-benzyloxy-phosphoryloxy)-4,6-dimethyl-phenyl]-3-methyl-butyrate (0.92 g) in ethyl acetate (10 ml) was hydrogenated over 5% platinum carbon (100 mg). The catalyst was removed by filtration through Celite layer, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel flash chromatography (dichloromethane:methanol=90:10→50:50). The purified product was concentrated under reduced pressure, and the aqueous acetonitrile solution of the residue was freeze-dried to obtain 0.21 g of 7-chloro-1-[2-methyl-4-(2-methyl-benzoylamino)-benzoyl]-2,3,4,5-tetrahydro-1H-benzo[b]azepin-5-yl 3-(2,4-dimethyl-6-phosphonooxy-phenyl)-3-methyl-butyrate as white amorphous solid.

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