[NH2:1][C:2]([CH3:7])([CH3:6])[C:3]([OH:5])=[O:4].[N:8]1[CH:13]=[CH:12][CH:11]=[CH:10][C:9]=1[C:14]1[S:18][C:17]([S:19](Cl)(=[O:21])=[O:20])=[CH:16][CH:15]=1>[OH-].[Na+].O1CCOCC1>[CH3:6][C:2]([NH:1][S:19]([C:17]1[S:18][C:14]([C:9]2[CH:10]=[CH:11][CH:12]=[CH:13][N:8]=2)=[CH:15][CH:16]=1)(=[O:20])=[O:21])([CH3:7])[C:3]([OH:5])=[O:4]To a solution of 2-amino-2-methylpropionic acid (2.0 grams, 19.4 mmole) in 1 N aqueous sodium hydroxide solution (45 mL) and dioxane (45 mL) was added 5-pyridin-2-ylthiophene-2-sulfonyl chloride (8.41 grams, 32.4 mmole). The resulting mixture was stirred at room temperature for 16 hours. Additional 1 N aqueous sodium hydroxide solution (45 mL) was added to the reaction mixture which was then extracted with diethyl ether. The organic extracts were discarded. The aqueous layer was acidified with 1 N hydrochloric acid solution and extracted with ethyl acetate. The ethyl acetate fractions were washed with brine, dried over magnesium sulfate and concentrated to afford 2-methyl-2-(5pyridin-2-ylthiophene-2-sulfonylamino)propionic acid as a white solid (2.18 grams, 34%).
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