Benzoyl Peroxide → 6-bromo-2-methyl-3-pivaloyloxymethyl-3,4,7,8-tetrahydro-6H-cyclopenta[g]quinazolin-4-one

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A mixture of 2-methyl-3-pivaloyloxymethyl-3,4,7,8-tetrahydro-6H-cyclopenta[g]-quinazolin-4-one (50 g), N-bromosuccinimide (31.2 g), benzoyl peroxide (0.1 g) and carbon tetrachloride (500 ml) was stirred and heated to reflux for 90 minutes. The mixture was cooled to 0° C. The mixture was filtered and the filtrate was evaporated. The residue was triturated under diethyl ether (400 ml). The mixture was cooled to 0° C. The precipitate was isolated, washed with diethyl ether and dried. The solid so obtained was purified by column chromatography using a 1:1 mixture of hexane and ethyl acetate as eluant. There was thus obtained 6-bromo-2-methyl-3-pivaloyloxy-methyl-3,4,7,8-tetrahydro-6H-cyclopenta[g]quinazolin-4-one (21 g), m.p. 98° C. (decomposes);

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