5-Chloro-2,3-difluoropyridine → 2,3-Difluoro-5-(3-methylisothiazol-5-yl)pyridine

Participants

Reaction Conditions

Reaction Steps

5-chloro-2,3-difluoropyridine (0.069 ml, 0.67 mmol), X-Phos (0.045 g, 0.094 mmol) and palladium (II) acetate (0.011 g, 0.047 mmol) were combined in 1,4-dioxane (0.2 M, 3.4 mL). To the reaction vessel was added 3-methyl-5-(trimethylstannyl)isothiazole (0.53 g, 2.0 mmol) and, after purging with argon, the reaction was stirred at 100° C. for 2 h and then concentrated in vacuo. The crude material was dissolved in minimal DCM and purified via MPLC (eluting first with 100% EtOAc followed by 20% EtOAc in hexanes -isocratic) to yield 2,3-difluoro-5-(3-methylisothiazol-5-yl)pyridine (0.139 g, 98% yield) as a yellow solid. 2,3-difluoro-5-(3-methylisothiazol-5-yl)pyridine was converted to the title compound using a procedure similar to 1-(4-methyl-6-phenylpyridazin-3-yl)hydrazine.

Provenance & Evidence