HCID 87556169, compound → HCID 87617683, compound

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Reaction Steps

To a solution of 3.55 g of (rac)-3-[(2-chloro-5-nitro-pyrimidin-4-yl)-(tetrahydro-pyran-4-yl)-amino]-2-methyl-propanoic acid ethyl ester (IV-45) in 40 mL of acetic acid was added 3.5 g (0.0627 g-atom) of iron powder. The mixture was heated at 80 degrees for 3 hours, and then filtered through Celite while still hot. The filter cake was washed with 100 mL of ethyl acetate and the filtrate was washed successively with 100 mL of water, 100 mL of 7.4 M ammonium 100 mL of water and 100 mL of brine. The aqueous layers were back extracted with 100 mL of ethyl acetate. The ethyl acetate layers were combined, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The residue was purified by silica gel chromatography, eluting with dichloromethane-ethyl acetate (40:60-0:100), followed by recrystallization from dichloromethane—hexanes to give 1.63 g of (rac)-2-chloro-7-methyl-9-(tetrahydro-pyran-4-yl)-5,7,8,9-tetrahydro-pyrimido[4,5-b][1,4]diazepin-6-one (VI-45) as white crystalline solid.

Provenance & Evidence