1-Bromo-2-methylpropane → N-(5-chloro-3-methylpyridin-2-yl)-4-fluoro-N-isobutylbenzenesulfonamide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

N-(5-chloro-3-methylpyridin-2-yl)-4-fluorobenzenesulfonamide (502 mg, 1.67 mmol) was dissolved in acetonitrile (3.5 mL) and to this solution was added 2-(tert-butyl)-1,1,3,3-tetramethylguanidine (350 μL, 1.67 mmol). The solution was left to stir for 15 minutes then 1-bromo-2-methylpropane (363 μL, 3.34 mmol) was added. The reaction vessel was sealed and heated by microwaves to 150° C. for 1 hour. After cooling, additional 0.5 eq of 2-(tert-butyl)-1,1,3,3-tetramethylguanidine was added, along with 1 eq of 1-bromo-2-methylpropane. The reaction vessel was sealed and heated by microwaves to 150° C. for an additional 1 hour. The solution was concentrated in vacuo and the crude product extracted to the organic phase of an aqueous workup between ethyl acetate and water. The organic phase was passed through a hydrophobic frit, concentrated in vacuo and purified by flash silica (Si) chromatography (0-25% ethyl acetate-cyclohexane gradient). The relevant fractions were combined and evaporated to give the title compound (396 mg). LCMS (2 min, formic) Rt 1.38 min, m/z (ES+) 357 (M+H).

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