Water → 3-(Propan-2-yl)-5-(trichloromethyl)-1,2,4-oxadiazole

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A stirred solution of N-hydroxy-2-methylpropanimidamide (16.33 g, 160 mmol) in pyridine (16.81 mL, 208 mmol) and dichloromethane (165 mL) at −15° C. was treated with trichloroacetyl chloride (19.63 mL, 176 mmol) over 40 min. The reaction was allowed to warm to ambient temperature and stirred for 42 h. Water (100 mL) was added and the reaction was stirred for 30 min. The dichloromethane was removed and the residue was diluted with water (50 mL) and extracted with ether (300 mL). The ether layer was washed with water, dried over MgSO4 and concentrated to afford 3-(1-methylethyl)-5-(trichloromethyl)-1,2,4-oxadiazole (28.0 g, 76% yield) as an orange liquid. 1H NMR (400 MHz, CDCl3): δ 3.13 (septet, 1H, J=7.0 Hz), 1.36 (d, 6H, J=7.0 Hz).

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