1,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochloride → N-[(1R*,2R*)-2-Aminocyclopentyl]-5-methyl-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridine-2-carboxamide hydrochloride

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Reaction Steps

The compound obtained in Referential Example 61 (175 mg) was dissolved in N,N-dimethylformamide (3 mL), and to the solution were added 5-methyl-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridine-2-carboxylic acid lithium salt (90% purity, 258 mg), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (252 mg), 1-hydroxybenzotriazole monohydrate (60 mg), followed by stirring at room temperature for 2 days. The solvent was distilled away under reduced pressure by means of a pump, and the residue was partitioned by adding methylene chloride and saturated aqueous sodium hydrogencarbonate. The organic layer was washed with saturated brine, and was dried over sodium sulfate anhydrate. The solvent was distilled away under reduced pressure, and the residue was purified by silica gel flash column chromatography (methylene chloride:methanol=47:3). The resultant pale-yellow oily matter was dissolved in hydrochloric acid-ethanol (5 mL), and the solution was stirred at room temperature for 1 hour. Ethyl acetate was added thereto, and the solvent was removed under reduced pressure. Ethyl acetate was added to the residue, and the resultant precipitate was collected by filtration, to thereby give the title compound (120 mg).

Provenance & Evidence