Reaction Steps
Diethyl N-(4-((1,2-dihydro-3-methyl-1-oxobenzo[f]quinazolin-9-yl)methoxy)benzoyl)-L-glutamate (0.18 g, 0.33 mmol) was suspended in ethanol (2 ml) and 0.25 N NaOH (8 ml) and stirred 1.5 hours at room temperature with intermittent periods of sonication. Additional ethanol (4 ml) and warming were required to obtain a homogeneous solution. The solution was stirred 3 hours at room temperature and then adjusted to pH 3 with 1 N HCl. The resulting suspension was filtered, and the white solid washed with water and dried under high vacuum to give N-(4-((1,2-dihydro-3-methyl-1-oxobenzo[f]quinazolin-9-yl)methoxy)benzoyl)-L-glutamic acid (0.158 g). 1H NMR (DMSO-d6, 300 MHz) δ: 1.87-2.16 (m, 2H, glu CH2). 2.35 (t, J=7 Hz, 2H, glu CH2), 2.44 (s, 3H, CH3), 4.33-4.43 (m, 1H, glu CH), 5.43 (s, 2H, CH2O), 7.16 (d, J=9 Hz, 2H, Ar), 7.64 (d, J=9 Hz, 1H, Ar), 7.74 (dd, J=8,2 Hz, 1H, Ar), 7.88 (d, J=9 Hz, 2H, Ar), 8.08 (d, J=8 Hz, 1H, Ar), 8.26 (d, J=9 Hz, 1H, Ar), 8.47 (d, J=8 Hz, 1H, glu NH), 9.94 (s, 1H, Ar), 12.36 (br s, 2H, CO2H's ), 12.59 (s, 1H, N2H). Anal. Calculated for C26H23N3O7.1/4H2O: C, 63.22; H, 4.79; N, 8.51. Found: C, 63.23; H, 4.80; N, 8.48.
