Tetrahydrofuran → tert-butyl (3S*,5R*)-3-[({2-tert-butyl-4-[(furan-2-ylmethyl)amino]pyrimidin-5-yl}carbonyl)(2-methylpropyl)amino]-5-(1,2,4-oxadiazol-3-yl)piperidine-1-carboxylate

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Reaction Steps

Hydroxylamine hydrochloride (35 mg) was dissolved in THF (3 ml)-methanol (3 ml), triethylamine (0.07 ml) was added, and the mixture was stirred at room temperature for 1 hr. A solution of tert-butyl (3S*,5R*)-3-[({2-tert-butyl-4-[(furan-2-ylmethyl)amino]pyrimidin-5-yl}carbonyl)(2-methylpropyl)amino]-5-(2H-tetrazol-5-yl)piperidine-1-carboxylate (120 mg) in THF (3 ml) was further added, and the mixture was stirred at 60° C. for 3 hr. The reaction mixture was allowed to cool to room temperature, and diluted with water, and the mixture was extracted with ethyl acetate. The extract was dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The obtained residue was dissolved in trimethyl orthoformate (5 ml), 4-methylbenzenesulfonic acid (20 mg) was added and the mixture was stirred at 100° C. for 10 hr. The reaction mixture was concentrated under reduced pressure, and the residue was subjected to silica gel chromatography. The fraction eluted with ethyl acetate-hexane (5:95-50:50) was concentrated under reduced pressure to give the object compound (72.6 mg).

Provenance & Evidence