CN(C=O)C.[CH2:6]([Cl:8])Cl.P(Cl)(Cl)(Cl)=O.[CH3:14][O:15][C:16]1[CH:17]=[C:18]2[C:22](=[CH:23][CH:24]=1)[N:21]([C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)[C:20](=[O:31])[CH2:19]2>C(Cl)(Cl)Cl.N1C=CC=CC=1.CC(=O)OCC>[Cl:8][C:6]1[N:21]([C:25]2[CH:26]=[CH:27][CH:28]=[CH:29][CH:30]=2)[C:22]2[C:18]([C:19]=1[CH:20]=[O:31])=[CH:17][C:16]([O:15][CH3:14])=[CH:24][CH:23]=2
A solution of DMF (2.3 ml) and DCM (2.3 ml) under argon was cooled to 0° C. With stirring, phosphorus oxychloride (2.14 ml, 22.9 mmol) was added within 15 min, and the mixture was stirred for further 30 min at 0° C. Then the compound of step 2 (557 mg, 2.33 mmol), dissolved in chloroform (5.77 ml) and pyridine (1.15 ml), was added to the cooled solution. The reaction mixture was stirred at room temperature overnight. The mixture was slowly poured into 300 ml of ice and after a few minutes EA was added. The organic layer was separated, dried over sodium sulfate, filtered and evaporated under reduced pressure. Column chromatography of the residue on silica gel (EA/HEP 1:8) yielded 456 mg of the title compound as a white solid.
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