反应详情

A mixture of 4-bromo-5-(chloroacetyl)thiophene-2-carbonitrile (430 mg, 1.6 mmol), prepared in the previous step, and N-(2-hydroxy-1,1-dimethylethyl)thiourea (241.2 mg, 1.6 mmol), prepared in step 2 of Example 52, in 10 mL of absolute ethanol was refluxed under nitrogen for 2.5 h. The solvent was concentrated to approximately two thirds its volume. The solid present was collected by filtration and dried under reduced pressure to give 4-bromo-5-{2-[(2-hydroxy-1,1-dimethylethyl)amino]-1,3-thiazol-4-yl}thiophene-2-carbonitrile hydrochloride (367.8 mg, 58%) as a yellow solid, mp 177.5-178.5° C.; MS (ESI) m/z 358 [M+H]+.

1. temperaturewas refluxed under nitrogen for 2.5 h
2. concentrationThe solvent was concentrated to approximately two thirds its volume
3. filtrationThe solid present was collected by filtration
4. customdried under reduced pressure