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ChemicalBook CAS DataBase List N-Tosyl-5-bromo-4,7-diazaindole
1201186-54-0

N-Tosyl-5-bromo-4,7-diazaindole synthesis

3synthesis methods
A solution of anhydrous DMF (272 mL) dissolved with 2-bromo-5H-pyrrolo[2,3-b]pyrazine (78.0 g, 394 mmol) was configured. The temperature is maintained at 0-5 °C (within which the subsequent reaction has been maintained), and the solution was droppedly added to the sodium (12.8 g, 532 mmol) anhydrous DMF (543 mL) suspension in the stirred state within 60 minutes. The solution turned brown and the reaction solution was stirred for about 30 min. Then, within 60 minutes, anhydrous DMF (272 mL) dissolved with p-toluenesulfonyl chloride (94.0 g, 492 mmol) was added. After stirring the mixed solution for about 1 h, it was heated to ambient temperature and stirred for about 18 h. Slowly pour the reaction mixture into ice water (6 L) and added 2.5 N NaOH in water (50.0 mL, 125 mmol). Filter the sediment to collect and stirred 3 times with cold water (200 mL). Finally, the collected products were filtered and dried to a constant weight in a vacuum oven at about 55 °C to obtain N-Tosyl-5-bromo-4,7-diazaindole (134.6 g, 97%).
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Yield:1201186-54-0 97%

Reaction Conditions:

Stage #1:2-bromo-5H-pyrrolo[2,3-b]pyrazine with sodium hydride in N,N-dimethyl-formamide at 0 - 5; for 0.5 h;
Stage #2:p-toluenesulfonyl chloride in N,N-dimethyl-formamide at 0 - 20;

Steps:

7.A
A solution of 2-bromo-5H-pyrrolo[2,3-b]pyrazine (78.0 g, 394 mmol, Ark Pharm) in anhydrous DMF (272 mL) was added drop-wise over about 60 min to a stirred suspension of NaH (12.8 g, 532 mmol) in anhydrous DMF (543 mL) at about 0-5° C. The brown reaction solution was stirred for about 30 min at about 0-5° C. then a solution of p-toluenesulfonyl chloride (94.0 g, 492 mmol) in anhydrous DMF (272 mL) was added drop-wise over about 60 min at about 0-5° C. The reaction mixture was stirred at about 0-5° C. for about 1 h then allowed to warm to ambient temperature and stirred for about 18 h at ambient temperature. The reaction mixture was poured slowly into ice water (6 L), followed by the addition of aqueous 2.5 N NaOH (50.0 mL, 125 mmol). The precipitate was collected by filtration and stirred with cold water (3×200 mL). The solid was collected by filtration and dried to constant weight in a vacuum oven at about 55° C. to yield 2-bromo-5-tosyl-5H-pyrrolo[2,3-b]pyrazine (134.6 g, 97%) as a pale beige solid: LC/MS (Table 2, Method d) Rt=1.58 min; MS m/z: 352/354 (M+H)+.

References:

ABBOTT LABORATORIES US2009/312338, 2009, A1 Location in patent:Page/Page column 60

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