Trifluoroacetic acid → 2-(Trifluoromethyl)thieno[3,2-d]pyrimidin-4(3H)-one

Participants

Reaction Conditions

Reaction Steps

To a stirring solution of methyl 3-aminothiophene-2-carboxylate (45a, 1.57, 10.0 mmol) in EtOH (10 mL) was added trifluoroacetamidine (2.24 g, 2 eq) and trifluoroacetic acid (1.54 ml, 2 eq). The resulting mixture was heated to 150° C. for 1 hour in microwave reactor. The reaction mixture was cool and filtered to provide 2-(trifluoromethyl)thieno[3,2-d]pyrimidine-4(3H)-one 45b as a solid (0.61 g). 1H NMR (400 MHz, MeOD) δ ppm: 7.49 (d, J=5.29 Hz, 2H), 8.18 (d, J=5.29 Hz, 1H).

Provenance & Evidence