Diisopropylethylamine → 2-[Methyl-(2-iodo-phenyl)-amino]benzo[d][1,3]oxazin-4-one

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A solution of 2-methoxycarbonylphenyl isocyanate (1.0 g, 5.6 mmol), N-methyl-2-iodoaniline, hydrochloride (1.6 g, 5.9 mmol) and N,N-diisopropylethylamine (1.1 mL, 6.3 mmol) in 100 mL of toluene was refluxed under N2 for 72 hours. The sample was concentrated, and partitioned between chloroform and 10% HCl. The chloroform was dried (MgSO4), filtered, concentrated and chromatographed (silica gel, methylene chloride) to give the title compound as a yellow solid, mp 144°-148° C.

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