2-Aminothiazole → 2,2,3,3-tetramethyl-N-1,3-thiazol-2-ylcyclopropanecarboxamide

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To a solution of 2-aminothiazole (0.39 g, 3.9 mmol) in 10 mL of methylene chloride at 0° C. was added a solution of the product from Example 1A in 8 mL of chloroform, followed by triethylamine (1.0 mL, 7.7 mmol). The mixture was stirred for 7 hours at 35° C., cooled to ambient temperature and diluted with water. The phases were separated and the aqueous phase was extracted with methylene chloride. The combined organic extracts were washed twice with water and then brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. Purification by column chromatography (SiO2, 30-60% ethyl acetate/hexanes gradient) afforded 0.11 g (14%) of the title compound. 1H NMR (CDCl3, 300 MHz) δ ppm 1.18 (s, 1H), 1.25 (s, 6H), 1.35 (s, 6H), 6.92 (d, J=3.4 Hz, 1H), 7.39 (d, J=3.4 Hz, 1H), 10.7 (s, 1H); MS (DCI/NH3) m/z 225 (M+H)+. Anal. Calculated for C11H16N2OS: C, 58.90; H, 7.19; N, 12.49. Found: C, 59.03; H, 7.34; N, 12.34.

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