[NH2:1][C:2]1[CH:11]=[CH:10][C:5]([C:6]([O:8][CH3:9])=[O:7])=[CH:4][C:3]=1[C:12](=[O:23])[NH:13][C:14]([C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1)([CH3:16])[CH3:15].[CH:24]([O-])([O-])OCC.O>CN(C=O)C>[O:23]=[C:12]1[C:3]2[C:2](=[CH:11][CH:10]=[C:5]([C:6]([O:8][CH3:9])=[O:7])[CH:4]=2)[N:1]=[CH:24][N:13]1[C:14]([C:17]1[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=1)([CH3:16])[CH3:15]To a solution of methyl 4-amino-3-[(2-phenylpropan-2-yl)carbamoyl]benzoate (0.13 g, 0.42 mmol) in DMF (2.5 mL) was added ethyl orthoformate (3.0 mL, 18 mmol) followed by one scoop of 3 Å molecular sieves. The reaction mixture was heated to 150° C. and stirred for 1 d. The mixture was cooled to rt, water was added and the mixture was extracted with EtOAc (2×). The combined organic phases were then washed with water, and brine, dried over anhydrous Na2SO4, filtered and concentrated. The residue was purified by flash silica gel chromatography (50% to 100% EtOAc/hexanes) to afford methyl 4-oxo-3-(2-phenylpropan-2-yl)-3,4-dihydroquinazoline-6-carboxylate (0.11 g, 84%). LC-MS: (FA) ES+ 323.
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