Dimethylformamide → (R)-tert-Butyl 1-(3-benzyl-7-chloro-4-oxo-3,4-dihydroquinazolin-2-yl)-2-methylpropylcarbamate

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Reaction Steps

A dry 3-necked, round bottomed flask, equipped with a magnetic stirrer and nitrogen inlet, is charged with 50 mL of DMF, 3.50 g (10 mmol) of (R)-[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 6.2), 1.34 mL of benzyl bromide (98%), and 3.04 g of potassium carbonate. The mixture is stirred at room temperature overnight. TLC (hexanes/ethyl acetate 7:3) indicates complete reaction. The mixture is transferred into a Erlenmeyer flask and mixed with 100 mL of water. To the stirring mixture is then added hexanes, 50 mL. The formed white solid is collected by filtration to afford the title compound of Formula 203 (R)-[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 are separated and the organic is concentrated to dryness. The residue is chromatographed to afford an additional yield of the title compound.

Provenance & Evidence