[CH3:1][C:2]1([CH3:21])[O:7][C:6](=O)[NH:5][C:4]2[CH:9]=[CH:10][C:11]([C:13]3[CH:14]=[C:15]([CH:18]=[CH:19][CH:20]=3)[C:16]#[N:17])=[CH:12][C:3]1=2.COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:31])=CC=1.C(OCC)(=O)C>CC1C=CC=CC=1C>[CH3:1][C:2]1([CH3:21])[O:7][C:6](=[S:31])[NH:5][C:4]2[CH:9]=[CH:10][C:11]([C:13]3[CH:14]=[C:15]([CH:18]=[CH:19][CH:20]=3)[C:16]#[N:17])=[CH:12][C:3]1=2A mixture of 3-(4,4-dimethyl-2-oxo-1,4-dihydro-2H-benzo[d][1,3]oxazin-6-yl)-benzonitrile (1 g, 3.6 mmol) and Lawesson's reagent (1.8 g, 4.3 mmol) in o-xylene (30 mL) was heated at reflux overnight. The reaction mixture was cooled to room temperature, poured into ethyl acetate (50 mL) and washed with 1 N HCl (2×20 mL). The organic layer was dried over sodium sulfate and concentrated. The residue was purified via flash chromatography (silica gel, 20% ethyl acetate/hexane) to give 3-(4,4-dimethyl-2-thioxo-1,4-dihydro-2H-benzo[d][1,3]oxazin-6-yl)-benzonitrile (0.21 g, 20%) as a white solid: mp 236-237° C.; 1H-NMR (DMSO-d6) δ 12.3 (s, 1H), 8.24 (s, 1H), 8.05 (d, 1H, J=8.07 Hz), 7.82 (d, 1H, J=7.68 Hz), 7.74-7.64 (m, 3H), 7.14 (d, 1H, J=8.78 Hz), 1.71 (s, 6H); MS (APCI) m/z 295 ([M+H]+, 100%); Anal. Calcd. For C17H14N2OS: C, 69.36; H, 4.79; N, 9.52. Found: C, 68.35; H, 4.91; N, 9.07
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