Calcium Carbonate → 2-(tert-Butoxycarbonylaminomethyl)-4-methylthiazole-5-carboxylic acid ethyl ester

참여 물질

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반응 단계

To a solution of 5.02 g of (tert-butoxycarbonylamino)acetothioamide in 75 ml of ethanol were added 3.92 ml of ethyl 2-chloroacetoacetate and 2.75 g of calcium carbonate, and the mixture was stirred at 50° C. for 6 hours. The reaction solution was filtered, and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel column chromatography, eluting with a 5:1 mixture of toluene and ethyl acetate to give 5.65 g (yield 71%) of the title compound.

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