tert-Butyl piperazine-1-carboxylate → 1-(tert-Butoxycarbonyl)-4-[(6-methyl-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridin-2-yl)carbonyl]piperazine

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Reaction Steps

To a solution of lithium 6-methyl-4,5,6,7-tetrahydrothiazolo[5,4-c]pyridine-2-carboxylate (293 mg) in N,N-dimethylformamide (10 ml) were added 1-(tert-butoxycarbonyl)piperazine (294 mg), 1-hydroxybenzotriazole monohydrate (214 mg) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (303 mg) at room temperature. After stirring for 38 hours, methylene chloride (20 ml) and water (200 ml) were added to the reaction mixture to separate it into layers. The water layer thus obtained was extracted with methylene chloride (3×10 ml). The organic layers were combined, washed with a saturated aqueous solution (100 ml.) of sodium bicarbonate, dried over anhydrous sodium sulfate and distilled under reduced pressure to remove the solvent. The residue was purified by chromatography on a silica gel column (methylene chloride:acetone=2:1), whereby the title compound (300 mg) was obtained as a pale yellow viscous substance.

Provenance & Evidence