Triethylamine hydrochloride → (S)-2-sec-Butylamino-6-(2H-tetrazol-5-yl)-isonicotinic acid methyl ester

Participants

Reaction Steps

Heat a suspension of (S)-2-sec-butylamino-6-cyano-isonicotinic acid methyl ester (932 mg, 4.0 mmol), sodium azide (780 mg, 12 mmol), and triethylamine hydrochloride (1.65 g, 12 mmol) in toluene (13 mL) at 90° C. for 2 days. Cool to room temperature and extract with water (3×30 mL), acidify the combined aqueous layers to about pH=2 using 1 N HCl, extract the desired product with ethyl acetate (4×50 mL), dry (sodium sulfate) and concentrate to give the title compound (720 mg, 65%).

Provenance & Evidence