(Bis(2-methoxyethyl)amino)sulfur trifluoride → Tert-butyl 3-fluoro-4-[(6-nitrothieno[3,2-b]pyridin-7-yl) amino]piperidine-1-carboxylate

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Reaction Steps

To a solution of tert-butyl 3-hydroxy-4-[(6-nitrothieno[3,2-b]pyridin-7-yl)amino]piperidine-1-carboxylate (716 mg, 1.82 mmol) in methylene chloride (4 mL) cooled at 0° C. was added slowly 2-methoxy-N-(2-methoxyethyl)-N-(trifluoro-λ(4)-sulfanyl)ethanamine (0.50 mL, 2.7 mmol). The reaction was stirred at room temperature for 4 h. The mixture was diluted with dichloromethane, washed with water, and concentrated. The residue was purified on silica gel (eluting with 0 to 30% EtOAc in dichloromethane) to give the desired product (0.32 g, 44%) as a mixture of cis- and trans-isomers mixture. LCMS calculated for C17H22FN4O4S (M+H)+: m/z=397.1. Found: 397.1.

Provenance & Evidence