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    • 2. 发明授权
    • Process for the synthesis of 5-(&agr;-hydroxyalkyl) benzo[1,3]dioxols
    • 合成5-(α-羟基烷基)苯并[1,3]二氧杂环戊烯的方法
    • US06342613B1
    • 2002-01-29
    • US09856752
    • 2001-05-23
    • Valerio BorzattaDario Brancaleoni
    • Valerio BorzattaDario Brancaleoni
    • C07D31750
    • C07D317/46C07D317/54
    • The present invention regards a three-step process for the synthesis of 5-(&agr;-hydroxyalkyl) benzo[1,3]dioxols. The process comprises: (i) the reaction of pyrocatechin (1,2-dihydroxybenzene) with a dihalo or di-alkoxyalkane, with the formation of a benzo[1,3]dioxol derivative; (ii) 5-selective catalytic acylation of the benzo[1,3]dioxol, with formation of a 5-alkanoylbenzo[1,3]dioxol and its subsequent (iii) reduction to 5-(&agr;-hydroxyalkyl) benzo[1,3]dioxol. Also described are new benzodioxols obtainable using the above-mentioned process. The process of the invention is industrially simple and has low environmental impact; it allows to obtain in high yields derivatives of considerable interest, in particular for the perfumery industry, and in the sector of insecticides.
    • 本发明涉及合成5-(α-羟基烷基)苯并[1,3]二氧杂环戊烯的三步法。 该方法包括:(i)焦儿茶酚(1,2-二羟基苯)与二卤代或二烷氧基烷烃的反应,形成苯并[1,3]二氧杂环戊烯衍生物; (ii)苯并[1,3]二氧杂环戊烷的5-选择性催化酰化,形成5-烷酰基苯并[1,3]二氧杂环戊烯,随后(iii)还原成5-(α-羟基烷基)苯并[ 3]二氧杂环戊烯。 还描述了可使用上述方法获得的新的苯并二恶醇。 本发明工艺简单,环境影响小; 它允许获得高产量的衍生物,特别是香料工业以及杀虫剂领域的相当大的兴趣。