Triethylamine → Methyl N-(1,3-benzodioxol-5-ylcarbonyl)-D-tryptophanate

Participants

Reaction Conditions

Reaction Steps

To a suspension of D-tryptophan methyl ester hydrochloride (10.2 g) in anhydrous CH2Cl2 (150 ml) cooled at 0° C. was added dropwise triethylamine (12.3 ml). To the resulting solution solid piperonyloyl chloride (8.16 g) was added portionwise at the same temperature, and the mixture was stirred at room temperature for 2 h. The mixture was washed successively with water, 0.5N hydrochloric acid, water, a saturated aqueous solution of NaHCO3 and again with water. After drying over Na2SO4 and evaporation of the solvent under reduced pressure, the resulting oil on trituration from hot cyclohexane afforded the title compound as a white solid (14.7 g).

Provenance & Evidence