Piperazine → 8-Chloro-11-(piperazin-1-yl)-dibenzo[b,f][1,4]oxazepine

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A mixture of 8-chloro-10H-dibenzo[b,f][1,4]oxazepin-11-one (189JO29C) (17 mg, 0.069 mmol) and 2,4-bis(4-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide (16 mg, 0.040 mmol) in toluene (2 mL) was heated in capped tube using microwave assisted heating (130° C., 20 minutes). The reaction mixture was cooled to room temperature and MeI (18 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 (25 mg, 0.29 mmol) was added. The resulting mixture was heated in a capped tube at 130° C. over night then using microwave assisted heating (160° C., 30 minutes). The mixture was concentrated, diluted with EtOAc and washed with water. The organic phase was applied onto a SCX-2 ion exchange column. The column was washed with MeOH, and then the product was eluted with NH3 (7 N in MeOH) to give 9.0 mg (57%) of the title compound (189JO31). MS (ESI) 314 (MH+). Purity for MH+ (UV/MS) 92/100.

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