Water → 1H-Imidazole-2-ethanol, 5-((3,5-dichlorophenyl)thio)-4-(1-methylethyl)-1-(4-pyridinylmethyl)-, carbamate (ester)

Participants

Reaction Conditions

Reaction Steps

In 10 ml of dry tetrahydrofuran was dissolved 1.0 g (2.4 mmol) of the alcohol compound (123b), and the mixture was cooled to -20° C., followed by addition of 540 mg (2.9 mmol) of trichloroacetylisocyanate. After 3 minutes, the mixture was warmed to 0° C. and stirred for 10 minutes. There were added 4 ml of water and 2 ml of triethylamine, and the mixture was warmed at 50° C. for 2 hours. The mixture was diluted with ice-water, extracted with ethyl acetate, the extract was washed with water, dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (10% methanol/ethyl acetate), and recrystallized from ethyl acetate to give 930 mg of Compound I-138 as crystals (yield 85%). mp 189-191° C.

Provenance & Evidence