[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[C:9]3[CH:22]=[CH:21][C:20](OC)=[N:19][C:10]=3[C:11]3[C:17]([CH3:18])=[N:16][O:15][C:12]=3[CH2:13][N:14]=2)=[CH:4][CH:3]=1.P(Cl)(Cl)([Cl:27])=O.[OH-].[Na+].C([O-])([O-])=O.[Na+].[Na+]>CN(C=O)C>[Cl:27][C:20]1[CH:21]=[CH:22][C:9]2[C:8]([C:5]3[CH:6]=[CH:7][C:2]([Cl:1])=[CH:3][CH:4]=3)=[N:14][CH2:13][C:12]3[O:15][N:16]=[C:17]([CH3:18])[C:11]=3[C:10]=2[N:19]=1To 5-(4-chlorophenyl)-2-methoxy-10-methyl-7H-isoxazolo[5,4-c]pyrido[2,3-e]azepine (0.050 g, 0.147 mmol) were added phosphoryl chloride (1 mL, 11 mmol) and DMF (0.1 mL) at room temperature. The reaction was heated to 140° C. for 4 h using microwave irradiation before 2M aq. NaOH and 2M aq. Na2CO3 were added to quench the excess of reagent. The desired product was extracted using EtOAc (repeated 4 times). The organic layers were combined, dried over Na2SO4 and concentrated to dryness. A fraction of the residue was purified by reverse phase chromatography to give the title product as a white solid. LC/MS m/z 344 [M+H]+; 1H NMR (400 MHz, DMSO-d6) δ 7.80 (d, J=8.52 Hz, 1H), 7.49 (d, J=8.31 Hz, 1H), 7.46 (td, J=2.10, 8.70 Hz, 2H), 7.41 (td, J=2.10, 8.70 Hz, 2H), 4.80 (s, 2H), 2.56 (s, 3H).
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