4-Toluenesulfonyl chloride → benzyl 4-[(2,4,4-trimethylpentan-2-yl)amino]-1H-pyrrolo[3,2-c]pyridine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A solution of benzyl 1H-pyrrolo[3,2-c]pyridine-1-carboxylate 5-oxide (500 mg, 1.9 mmol, Step b) in chloroform was treated dropwise with 2,4,4-trimethylpentan-2-amine (1.57 mL, 8.5 mmol) and stirred for about 15 minutes. The mixture was cooled to 0° C. followed by the portion wise addition of p-toluenesulphonyl chloride (745 mg, 4.2 mmol). The reaction mixture was then stirred at room temperature for 1 hour, diluted with dichloromethane and washed with saturated sodium bicarbonate solution. The organic layer was separated, dried over anhydrous sodium sulfate and concentrated under vacuum to yield viscous oil. The crude product was purified by silica gel (100-200 mesh) column chromatography using ethyl acetate in hexane (1.5%) as eluent to yield benzyl 4-[(2,4,4-trimethylpentan-2-yl)amino]-1H-pyrrolo[3,2-c]pyridine-1-carboxylate (390 mg, 43%) as a pale yellow solid.

Provenance & Evidence