反应详情

19.0 g (66 mmol) of N-carbobenzoxydopamine obtained in Synthetic Example 1-(1) and 37.2 g (209 mmol) of hydrochloride of nicotinoyl chloride were added to 200 ml of pyridine. After stirring at room temperature for 12 hours, the mixture was allowed to react at 35°-40° C. for 2 hours. Then, the reaction mixture was poured into ice and a sodium carbonate solution followed by extraction with chloroform. The resulting extract was dried over anhydrous magnesium sulfate and the solvent was distilled off to obtain crude crystals. The thus-obtained crystals were recrystallized from ethyl acetate/diethyl ether (1:5 by volume) to obtain 23.5 g (yield: 71.6%) of the desired compound in the form of white crystals (m.p. 77°-78° C.).

1. customto react at 35°-40° C. for 2 hours
2. additionThen, the reaction mixture was poured into ice
3. extractiona sodium carbonate solution followed by extraction with chloroform
4. extractionThe resulting extract
5. dry with materialwas dried over anhydrous magnesium sulfate
6. distillationthe solvent was distilled off
7. customto obtain crude crystals
8. customThe thus-obtained crystals were recrystallized from ethyl acetate/diethyl ether (1:5 by volume)