Ethyl cyanoacetate → Benzothiazol-2-YL-acetic acid ethyl ester

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Reaction Conditions

Reaction Steps

Ethyl 2-(benzothiazol-2-yl)acetate was prepared by the method of Abbotto, Bradamante et. al. (J. Org. Chem. 2002, 16, 5753). A neat mixture of 2-aminothiophenol (6.94 g, 50 mmol) and ethyl cyanoacetate (5.65 g, 50 mmol) was heated at 120° C. for 3 hours at which time TLC analysis indicated that the reaction was complete as judged by the disappearance of starting material. The dark orange mixture was diluted with ethyl acetate/hexanes and purified by flash chromatography using 10-20% ethyl acetate/hexanes (Rf=0.35, 10% ethyl acetate/hexanes) as an eluant. After concentration by rotary evaporator, ethyl 2-(benzothiazol-2-yl)acetate could be obtained as a yellow oil in 72% yield (7.97 g). LCMS: 222.3 (M+H)+.

Provenance & Evidence