Piperazine → Isoloxapine

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A mixture of 8-chloro-10H-dibenzo[b,f][1,4]oxazepin-11-one (189JO29C) (30 mg, 0.069 mmol) and 2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide (29 mg, 0.040 mmol) in toluene (2 mL) was heated in a capped tube using microwave assisted heating (130° C., 20 minutes). The reaction mixture was cooled to room temperature and MeI (38 μL, 0.29 mmol) was added and the resulting mixture was heated in capped tube using microwave assisted heating (120° C., 20 minutes). The mixture was concentrated and the residue was taken up in pyridine (2 mL) and piperazine (24 mg, 0.29 mmol) was added. The resulting mixture was heated in a capped tube at 130° C. over night then heated using microwave assisted heating (160° C., 30 minutes). The mixture was concentrated, diluted with EtOAc and washed with water. The organic phase was dried (Na2SO4), concentrated and flash chromatographed (SiO2, toluene:EtOAc:MeOH, 4:2:0-2:2:1) to give 8.9 mg of the title compound (189JO47). MS (ESI) 328 (MH+). Purity for MH+ (UV/MS) 98/93.

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