Oxalyl chloride → 2-(4-Tert-butylphenyl)-6-nitro-3,1-benzoxazin-4-one

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To a suspension of 2-(4-tert-butylbenzoylamino)-5-nitrobenzoic acid (37.1 g, 108 mmol) and N,N-dimethylformamide (0.4 mL, 5.4 mmol) in methylene chloride (200 mL) was added oxalyl chloride (10.4 mL, 119 mmol) in a dropwise manner. After stirring for 2 h, the mixture was filtered and the small amount of black solid was discarded. The filtrate was concentrated in vacuo to give 32.9 g (94%) of the title compound as a light brown solid; mp 159-61° C.

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