[CH3:1][N:2]1[CH2:7][CH2:6][N:5]([C:8]2[N:13]=[C:12]3[N:14]([Si](C(C)C)(C(C)C)C(C)C)[CH:15]=[CH:16][C:11]3=[CH:10][CH:9]=2)[CH2:4][CH2:3]1.[CH3:27][N:28](C=O)C.ClS(N=C=O)(=O)=O.CCOC(C)=O>C(#N)C>[CH3:1][N:2]1[CH2:3][CH2:4][N:5]([C:8]2[N:13]=[C:12]3[NH:14][CH:15]=[C:16]([C:27]#[N:28])[C:11]3=[CH:10][CH:9]=2)[CH2:6][CH2:7]1
In a 25 mL round-bottomed flask, 6-(4-methylpiperazin-1-yl)-1-(triisopropylsilyl)-1H-pyrrolo[2,3-b]pyridine (320 mg, 859 μmol, Eq: 1.00) was combined with DMF (11.8 ml) to give a colorless solution. The reaction mixture was cooled to −20° C. and stirred for 5 min. Chlorosulfonyl isocyanate (365 mg, 224 μl, 2.58 mmol, Eq: 3) in acetonitrile (11.8 ml) was added dropwise and the resultant cooled reaction was stirred at −20° C. and stirred for 3 hrs The reaction mixture was poured into 25 mL EtOAc and extracted with sat NaCl (3×20 mL). The crude material was purified by flash chromatography (silica gel, 12 g, 5% to 10% MeOH in DCM) to give 6-(4-methylpiperazin-1-yl)-1H-pyrrolo[2,3-b]pyridine-3-carbonitrile (113 mg, 55%).
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