Methyl chloroformate → 4-[2-(4-Fluoro-benzoylamino)-4-methoxy-benzothiazol-7-yl]-piperidine-1-carboxylic acid methyl ester

Participants

Reaction Steps

To a suspension of 0.1 g (0.24 mMol) 4-fluoro-N-[4-methoxy-7-piperidine-4-yl-benzothiazol-2-yl]-benzamide hydrochloride (1:1) in 3 ml THF were added 0.036 ml triethyl amine. At 0° C. 0.020 ml (0.26 mMol) chloro formic acid methyl ester was added dropwise and stirred for 1 h. Then a mixture of 5 ml sat. aqueous sodium bicarbonate and 10 ml water were added. This was extracted three times with 15 ml ethyl acetate, the combined organic phase were dried over sodium sulfate and evaporated to dryness in vacuo. One obtained 0.080 g (76%) 4-[2-(4-fluoro-benzoylamino)-4-methoxy-benzothiazol-7-yl]-piperidine-1-carboxylic acid methyl ester as a white solid. F.p.: 238-239° C.

Provenance & Evidence