Hydrochloric Acid → HCID 136050798, compound

Participants

Reaction Steps

To a solution of tert-butyl 3-[2-amino-3-formyl-6-(2-hydroxyphenyl)-4-pyridinyl]-1-piperidinecarboxylate (0.100 g, 0.252 mmol) in 1,4-dioxane (2.0 mL) under an argon atmosphere was added a HCl solution of 1,4-dioxane (4N, 2.0 mL), and the stirring was continued at room temperature for 1 hr. The mixture was diluted with Et2O, and the supernatant was decanted. The precipitates were washed twice with Et2O, and dried under reduced pressure to give a pale yellow solid, which was then dissolved in methanol (2.0 mL). The mixture was allowed to cool with ice-water bath. Then sodium cyanoborohydride (0.047 g, 0.76 mmol) was added to the mixture under an argon atmosphere. The mixture was allowed to warm to room temperature, and the stirring was continued overnight. The resulting mixture was concentrated under reduced pressure. The residue was dissolved in a mixture of methylene chloride (2.0 mL) and THF (2.0 mL). To the mixture was added triethyl-amine (0.140 mL, 1.006 mmol) followed by di-tert-butyl dicarbonate (0.110 g, 0.503 mmol), and the stirring was continued for 2 hrs. The resulting mixture was partitioned between ethyl acetate and water. The separated organic phase was washed with brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (hexane:ethyl acetate, 2:1) to give tert-Butyl 3-[2-amino-6-(2-hydroxyphenyl)-3-(methoxy-methyl)-4-pyridinyl]-1-piperidinecarboxylate. (0.033 g, yield; 47%)

Provenance & Evidence