A facile synthesis of piperonol is reported from catechol. Reacted catechol with excess dichloromethane in an autoclave under nitrogen atmosphere gave 88 4% 1,3-benzodioxole(1), which is directly chlo romethylated to ...A facile synthesis of piperonol is reported from catechol. Reacted catechol with excess dichloromethane in an autoclave under nitrogen atmosphere gave 88 4% 1,3-benzodioxole(1), which is directly chlo romethylated to yield 90 1% 5-chloromethyl 1,3-benzodioxole(2) by hydrogen chloride saturated triformol. 2 can easily convert to piperonal by treatment with alcoholic solution of Na 2CO 3 in yield of 97 7%. The total yield is 78%.展开更多
文摘A facile synthesis of piperonol is reported from catechol. Reacted catechol with excess dichloromethane in an autoclave under nitrogen atmosphere gave 88 4% 1,3-benzodioxole(1), which is directly chlo romethylated to yield 90 1% 5-chloromethyl 1,3-benzodioxole(2) by hydrogen chloride saturated triformol. 2 can easily convert to piperonal by treatment with alcoholic solution of Na 2CO 3 in yield of 97 7%. The total yield is 78%.
