[CH3:1][N:2]1[C:7](=[O:8])[N:6]2[CH:9]=[N:10][C:11]([C:12]([NH:14][C:15]3[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=3)=O)=[C:5]2[N:4]=[N:3]1.P12(SP3(SP(SP(S3)(S1)=S)(=S)S2)=S)=[S:22].C[Si](C)(C)O[Si](C)(C)C>C(Cl)Cl>[CH3:1][N:2]1[C:7](=[O:8])[N:6]2[CH:9]=[N:10][C:11]([C:12](=[S:22])[NH:14][C:15]3[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=3)=[C:5]2[N:4]=[N:3]1A mixture of 3-methyl-4-oxo-N-phenyl-3,4-dihydroimidazo[5,1-d][1,2,3,5]tetrazine-8-carboxamide (430 mg, 1.59 mmol), phosphorus pentasulfide (212 mg, 0.48 mmol) and hexamethyldisiloxane (680 μL, 3.18 mmol) in DCM (20 mL) was refluxed overnight. The crude product was absorbed on silica and was purified by flash chromatography using a gradient elution of DCM:MeOH (100:0 to 98:2) to give 372 mg of 3-methyl-4-oxo-N-phenyl-3,4-dihydroimidazo[5,1-d][1,2,3,5]tetrazine-8-carbothioamide as a 1.5:1 inseparable mixture with the starting material.
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