18-Crown-6 → Ethyl 3-chloro-5-(2-methylphenyl)-1,2-thiazole-4-carboxylate

Participants

Reaction Conditions

Reaction Steps

Into a 100-mL round-bottom flask purged and maintained with an inert atmosphere of nitrogen, was placed ethyl 3,5-dichloro-1,2-thiazole-4-carboxylate (1 g, 4.42 mmol, 1.00 equiv), (2-methylphenyl)boronic acid (665 mg, 4.89 mmol, 1.11 equiv), Pd(OAc)2 (49.7 mg, 0.22 mmol, 0.05 equiv), KF (773 mg), 18-Crown-6 (117 mg, 0.44 mmol, 0.10 equiv), Tol (40 mL). The resulting solution was stirred overnight at 110° C. in an oil bath. The resulting solution was diluted with 50 mL of EA. The resulting mixture was washed with 5×30 mL of sodium chloride(aq). The mixture was dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was applied onto a silica gel column with ethyl acetate/petroleum ether (0:100). This resulted in 730 mg (59%) of ethyl 3-chloro-5-(2-methylphenyl)-1,2-thiazole-4-carboxylate as yellow oil.

Provenance & Evidence