Water → 2,2-Dimethyl-1-(2-thioxothiazolidin-3-yl)propan-1-one

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To a suspension of NaH (60 percent, 1.06 g, 26.5 mmol) in dry THF (10 mL) cooled at zero degrees C was added a solution of 2-mercaptothiazoline (3.0 g, 25.17 mmol) in dry THF (20 mL) followed by stirring at zero degrees C for 10 minutes. To the mixture was added trimethylacetyl chloride (3.1 mL, 25.17 mmol), the resultant mixture was then stirred at 25° C. for two hours. Water was added to the reaction mixture followed by extraction with ethyl acetate (100 mL), dry over anhydrous Na2SO4, and removal of the solvent in vacuo to give a crude product. Flash column chromatography of the crude product (silica gel, 17 percent ethyl ether in petroleum ether) afforded Compound 226 (4.68 g, 91 percent): pale-yellow solid; mp 48°-50° C.; Rf =0.19 (silica, 17 percent ethyl ether in petroleum ether); IR (CHCl3) νmax 2980, 1808, 1738, 1480, 1463, 1396, 1388, 1286, 1251, 1139, 1044, 1003, 874 cm-1 ; 1H NMR (300 MHz, CDCl3) δ 4.21 (t, J=7.3 Hz, 2 H, NCH2CH2S), 3.51 (t, J=7.3 Hz, 2 H, NCH2CH2S), 1.41 (s, 9 H, C(CH3)3); MS (FAB+) m/e (rel intensity) 204 (M+H, 100), 120 (27); HRMS for C8H14NOS2 (M+H), calcd 204.0517, found 204.0500.

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