Trichloroacetyl isocyanate → (2S,4S)-1-(p-nitrobenzyloxycarbonyl)-2-trichloroacetylaminocarbonyloxymethyl-4-acetylthiopyrrolidine

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Reaction Steps

(2S,4S)-1-(p-Nitrobenzyloxycarbonyl)-2-hydroxymethyl-4-acetylthiopyrrolidine (100 mg) was dissolved in 3 ml of dry ethyl acetate. To the solution was added 0.05 ml of trichloroacetyl isocyanate under ice-cooling in a nitrogen stream, followed by stirring at the same temperature for 1 hour. The mixture was diluted with ethyl acetate, washed successively with a saturated sodium bicarbonate solution and water, dried over anhydrous sodium sulfate and distilled to obtain (2S,4S)-1-(p-nitrobenzyloxycarbonyl)-2-trichloroacetylaminocarbonyloxymethyl-4-acetylthiopyrrolidine.

Provenance & Evidence