反应详情

A solution of 3-(5-amino-4-chloro-2-fluorophenyl)-1-methyl-6-(trifluoromethyl)-2,4(1H,3H)-pyrimidinedione (3.0 g, 8.89 mmol) in a tetrahydrofuran/ethanol solution (1:1) is treated with ethyl isothiocyanatoacetate (1.93 g, 13.34 mmol), refluxed for 9 hours, stirred at room temperature overnight, and concentrated in vacuo to obtain an orange-brown gum. Flash column chromatography of the gum using silica gel and 25% to 30% ethyl acetate in hexanes solutions gives the title product as a white foam (2.24 g, 52% yield, mp 95-103° C.) which is identified by 1H, 13C and 19F NMR spectral analyses.

1. temperaturerefluxed for 9 hours
2. concentrationconcentrated in vacuo
3. customto obtain an orange-brown gum