1,4-Dioxane hydrochloride → 4-{4-[(1E)-4-(2,6-diazaspiro[3.5]non-2-yl)but-1-en-1-yl]-2-methylbenzyl}-5-(propan-2-yl)-1H-pyrazol-3-yl beta-D-glucopyranoside

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Reaction Steps

Add 4.0 M HCl/1,4-dioxane (1.5 mL, 1.5 mmol) to a solution of tert-butyl 2-{(3E)-4-[3-methyl-4-({5-(propan-2-yl)-3-[(2,3,4,6-tetra-O-acetyl-beta-D-glucopyranosyl)oxy]-1 h-pyrazol-4-yl}methyl)phenyl]but-3-en-1-yl}-2,6-diazaspiro[3.5]nonane-6-carboxylate in dichloromethane (2 mL) and stir at rt for 4.0 h. Concentrate the mixture under the reduced pressure to a foamy solid. Treat the solid with 2.0 M ammonia in MeOH (2 mL) overnight. After 18 hours at room temperature, concentrate to remove the solvent under reduced pressure. The resulting residue is purified by preparative HPLC method: high pH, 19% B for 3 min, 19-34 B % for 5 min @ 85 mL/min using a 30×75 mm, 5 um C18XBridge ODB column, solvent A—H2O w NH4HCO3 @ pH 10, solvent B-MeCN to yield the title compound as solid (47 mg, 0.08 mmol). MS (m/z): 570.8, 571.8 (M+1), 568.7, 569.8 (M−1).

Provenance & Evidence