Diisopropylethylamine → HCID 69314204, compound

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Reaction Steps

Formula 506 where R1, R3 and R4 are H; R6 is Isopropyl; R6′ is H: W, Y and Z are —C═; and X is —N═: To a solution of dichloromethane (100 mL), 4-amino-nicotinic acid methyl ester (4.60 g, 30.2 mmol) and diisopropylethyl amine (8.25 mL, 46.7 mmol), was added (1-fluorocarbonyl-2-methyl-propyl)-carbamic acid benzyl ester (11.8 g, 46.7 mmol) at room temperature and the mixture stirred overnight. The solvent was removed under reduced pressure and the residue purified by flash silica gel chromatography using hexane-EtOAc (stepwise gradient from 3:1 to 1:1) as eluents to obtain the desired amide of Formula 506, 4-(2-benzyloxycarbonylamino-3-methyl-butyrylamino)-nicotinic acid methyl ester (10.5 g, 90.1%). MS (Cl) M/E: 386.2.

Provenance & Evidence