1,2-Dichloroethane → HCID 69315524, compound

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Reaction Steps

Formulae 508 and 509 where R1, R3 and R4 are H; R5 is Benzyl; R6 is Isopropyl; R6′ is H: W, Y and Z are —C═; and X is —N═: A solution of dichloromethane (200 mL), 4-(2-benzyloxycarbonylamino-3-methyl-butyrylamino)-nicotinic acid (10.0 g, 26.9 mmol) and EDC (7.74 g, 40.4 mmol) was stirred at room temperature for 2 hours until the complete consumption of the starting material was observed by reverse phase HPLC. Benzylamine (5.88 mL, 53.8 mmol) was then added and the mixture was stirred at room temperature overnight. The mixture was concentrated under vacuum and purified by silica gel chromatography using hexane-EtOAc (stepwise gradient from 3:1 to 1:2) as eluents to obtain the uncyclized product of Formula 508, [1-(3-benzylcarbamoyl-pyridin-4-ylcarbamoyl)-2-methyl-propyl]carbamic acid benzyl ester (4.45 g, 35.9%) and the cyclized product of Formula 509, [1-(3-benzyl-4-oxo-3,4-dihydro-pyrido[4,3-d]pyrimidin-2-yl)-2-methyl-propyl]-carbamic acid benzyl ester (1.85 g, 15.5%). 508: MS (Cl) M/E: 461.2; 509: MS (Cl) M/E: 443.2.

Provenance & Evidence