A dry 3-necked, round bottomed flask, equipped with a magnetic stirrer and nitrogen inlet, was charged with 50 mL of DMF, 3.50 g (10 mmol) of (S)-[1-(7-chloro-4-oxo-3,4-dihydro-quinazolin-2-yl)-2-methylpropyl]-carbamic acid tert-butyl ester (the compound of Formula 202 prepared, e.g., as described in Example 3.2), 1.34 mL of benzyl bromide (98%), and 3.04 g of potassium carbonate. The mixture was stirred at room temperature overnight. TLC (hexanes/ethyl acetate 7:3) indicated complete reaction. The mixture was transferred into a Erlenmeyer flask and mixed with 100 mL of water. To the stirring mixture was then added hexanes, 50 mL. The formed white solid was collected by filtration to afford the title compound of Formula 203 (S)-[1-(3-benzyl-7-chloro-4-oxo-3,4-dihydro-quinazolin-2-yl)-2-methylpropyl]-carbamic acid tert-butyl ester (also corresponding to Formula 107). The layers were separated and the organic was concentrated to dryness. The residue was chromatographed to afford an additional yield of the title compound. 1HNMR (300 MHz, DMSO-d6) δ (ppm)8.15(d,1H), 7.65(S,1H), 7.60(d,1H), 7.40–7.20(m,5H), 5.75(d,1H), 5.15(d,1H), 4.40(t,1H), 2.25(m,1H), 1.40–1.15(m,10H), 0.08(d, 3H), 0.35(d,3H).
