[CH:1](NC(C)C)(C)C.C([Li])CCC.[CH:13]([S:16][CH2:17][C:18]([O:20][CH2:21][CH3:22])=[O:19])([CH3:15])[CH3:14].CI.Cl>O1CCCC1>[CH:13]([S:16][CH:17]([CH3:1])[C:18]([O:20][CH2:21][CH3:22])=[O:19])([CH3:15])[CH3:14]A solution of diisopropylamine (15.4 mL, 0.11 mol) in tetrahydrofuran is cooled to 0° C., treated dropwise with a 2.04 M solution of n-butyllithium in tetrahydro-furan (51.4 mL, 0.105 mol), stirred at 0° C. for 30 minutes, treated dropwise with ethyl (isopropylthio)acetate (16.3 g, 0.1 mol), stirred at 0° C. for 1 hour, treated with methyl iodide (15.6 g, 0.11 mol), stirred at room temperature for 20 hours, and poured into an ice-water mixture (100 g) containing 15 mL of 6 N hydrochloric acid. The resulting aqueous mixture is extracted with ether. The combined organic extracts are washed sequentially with water, saturated sodium thiosulfate solution, water and brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo to obtain a brown solution. Vacuum distillation of the brown solution gives the title product as a liquid (10.0 g) which is identified by NMR spectral analysis.
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