1-Amino-5-chloro-2-(prop-1-yn-1-yl)-3-((2-(trimethylsilyl)ethoxy)methoxy)pyridin-1-ium 2,4,6-trimethylbenzenesulfonate → 6-Chloro-2-methylpyrazolo[1,5-a]pyridin-4-ol

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Reaction Steps

AcOH (5 mL) was added to 1-amino-5-chloro-2-(prop-1-yn-1-yl)-3-((2-(trimethylsilyl)ethoxy)methoxy)pyridin-1-ium 2,4,6-trimethylbenzenesulfonate. After stirring overnight, the AcOH was removed under vaco., the residue was treated with 2 M solution of LiOH (5 mL) at rt., and extracted with ethyl acetate. Combined organics were washed with brine, dried, filtered, and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography to provide of 6-chloro-2-methylpyrazolo[1,5-a]pyridin-4-ol 6.59. LCMS [M+H]+: 183.09. 1H NMR (400 MHz, CDCl3) ppm: δ 8.028 (s, 1H), 6.419 (d, J=6.8 Hz, 1H), 6.398 (d, J=6.8 Hz, 1H), 2.395 (s, 3H).

Provenance & Evidence