Thionyl Chloride → 5-(6-Bromoquinazolin-4-yl)-thiophen-2-sulfonyl chloride

Participants

Reaction Conditions

Reaction Steps

0.18 mL chlorosulfonic acid and 0.19 mL thionyl chloride were added to 0.1 g of 6-bromo-4-(2-thienyl)quinazoline (compound in Production Example 96) under ice-cooling in a stream of nitrogen, and the mixture was heated for 13 hours at 60° C., then neutralized by adding water and a sodium bicarbonate solution and extracted with dichloromethane. 5-(6-Bromoquinazolin-4-yl)-thiophen-2-sulfonyl chloride obtained by drying the organic layer over anhydrous sodium sulfate was dissolved in 3 mL tetrahydrofuran, then 0.3 mL morpholine was added thereto, and the mixture was stirred at room temperature for 1 hour. The solvent was removed, and the positional isomers were separated and purified by silica gel column chromatography (ethyl acetate/hexane) to give 57 mg of the title compound (colorless crystals).

Provenance & Evidence