[H-].[Na+].[Cl:3][C:4]1[C:5]([CH3:10])=[N:6][O:7][C:8]=1[NH2:9].[CH2:11]([C:13]1[S:21][C:16]2=[N:17][CH:18]=[CH:19][CH:20]=[C:15]2[C:14]=1[S:22](Cl)(=[O:24])=[O:23])[CH3:12]>C1COCC1>[Cl:3][C:4]1[C:5]([CH3:10])=[N:6][O:7][C:8]=1[NH:9][S:22]([C:14]1[C:15]2[C:16](=[N:17][CH:18]=[CH:19][CH:20]=2)[S:21][C:13]=1[CH2:11][CH3:12])(=[O:24])=[O:23]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.
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