Dicyclohexylcarbodiimide → 1-[3-(acetylthio)-2-methoxycarbonylmethylpropanoyl]-L-proline tert-butyl ester

Participants

Reaction Steps

To a solution of L-proline tert-butyl ester (1.71 g) and 3-hydroxybenzotriazole (1.35 g) in dichloromethane (15 ml), dicyclohexylcarbodiimide (2.06 g) and 3-acetylthio-2-methoxycarbonylmethylpropanoic acid (2.2 g) are added. After eighteen hours stirring at room temperature, the precipitate formed is filtered off, the filtrate is washed neutral, dried, and concentrated to dryness to yield 3.7 g of 1-[3-(acetylthio)-2-methoxycarbonylmethylpropanoyl]-L-proline tert-butyl ester. Rf =0.8 (silica gel-ethyl acetate).

Provenance & Evidence