HCID 20426825, compound → HCID 20426832, compound

Participants

Reaction Steps

To 300 ml of dried dimethylformamide, was added 5.6 g (0.05 mol.) of potassium tert-butoxide and 8.9 g (0.05 mol.) of 1-phenyl-5-mercaptotetrazole. The mixture was stirred for 20 minutes at room temperature. Thereafter, to the mixture which was cooled to 5° C. and kept there, was added gradually dropwise a solution prepared by adding 13 g (0.04 mol.) of 3-chloro-3-(2,4-dichlorophenyl)phthalide in 75 ml of dried dimethylformamide. After dropwise addition, the cooling bath was removed, and the mixture was stirred for 5 hours at room temperature. Thereto, 300 ml of a saturated aqueous solution of ammonium chloride was added. The reaction mixture was extracted with ethyl acetate repeatedly. The extract was washed with water, and the resulting organic layer was dried over anhydrous sodium sulfate. Sodium sulfate was filtered off with suction, and the filtrate was concentrated to yield 23.5 g of oily substance. This oily substance was separated and purified by flash column chromatography (silica gel: 800 g, eluate: hexane-ethyl acetate (3:1 by volume) mixture). Thus, the intended compound, 3-(1-phenyl-tetrazole-5-ylthio)-3-(2,4-dichlorophenyl)phthalide (3), was obtained in a form of white crystals. Yield 7.8 g, Melting Point 148° to 149° C.

Provenance & Evidence