反应详情

50 g of DL-tryptophan available from Nakarai Chemicals, Kyoto, Japan, was suspended in 500 ml of methanol and 40 ml of thionyl chloride was dropwise added thereto while vigorously stirring. The reaction was exothermic and the reaction mixture was allowed to be refluxed for 10 hours while stirring. Then, the solvent was distilled off and the resultant residue was washed with diethylether. Thus, DL-tryptophan methylester hydrochloride was obtained in the form of white crystals.

1. temperatureto be refluxed for 10 hours
2. stirringwhile stirring
3. distillationThen, the solvent was distilled off
4. washthe resultant residue was washed with diethylether