Sodium hydride → N-(4-chloro-3-methyl-5-isoxazolyl)-2-ethylthieno[2,3-b]-pyridine-3-sulfonamide

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Reaction Conditions

Reaction Steps

To a mixture of NaH (38 mg, 1.6 mmoles) in THF (5 ml) at ambient temperature was added 4-chloro-3-methyl-5-amino isoxazole (84 mg, 0.63 mmoles). The mixture was stirred 1 hr. at ambient temperature then cooled to 0° C. followed by the addition of 2-ethylthieno[2,3-b]pyridine-3-sulfonyl chloride (0.19 g, 0.73 mmoles) via cannula in THF (2 ml). The cooling bath was removed and the brown mixture was stirred 1 hr. at ambient temperature and then diluted with 3% NaOH (50 ml) and washed with CHCl3 (2×75 ml). The aqueous layer was acidified to pH 4 using concentrated HCl, upon which a precipitate formed. The aqueous phase was extracted with EtOAc (50 ml), and the organic layer was dried (MgSO4), filtered and concentrated to collect 0.23 g of a yellow oil. Recrystallization from EtOAc/hexanes provided 0.18 g (79%) of the title compound as a light yellow solid, m.p. 152-154° C.

Provenance & Evidence