Hydrochloric Acid → Ethyl 2-(4-piperidinyl)-4-thiazolecarboxylate monohydrochloride

Participants

Reaction Steps

A solution of 1,1-dimethylethyl 4-[4-(ethoxycarbonyl)-2-thiazolyl]-1-piperidine-carboxylate (11.1 g, 32.7 mmol) (i.e. the product of Example 1, Step A) in 100 mL of diethyl ether was treated with a solution of 2 M hydrogen chloride in diethyl ether (166 mL, 331 mmol) at 0° C. The resulting reaction precipitate was dissolved with 100 mL of absolute ethanol and was stirred overnight at room temperature. The reaction mixture was evaporated in vacuo, re-dissolved in ethanol and evaporated again to give a solid. The resulting solid was placed under a high vacuum for several hours to give 10.38 g of the title compound as a hygroscopic white powder.

Provenance & Evidence