申请人:Endura S.p.A.
公开号:US06342613B1
公开(公告)日:2002-01-29
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.
本发明涉及一种合成5-(&agr;-羟基烷基)苯并[1,3]二噁烷的三步过程。该过程包括:(i) 对邻苯二酚(1,2-二羟基苯)与二卤代烷或二烷氧基烷的反应,形成苯并[1,3]二噁烷衍生物;(ii) 对苯并[1,3]二噁烷进行5-选择性催化酰化,形成5-烷酰基苯并[1,3]二噁烷,随后(iii) 还原为5-(&agr;-羟基烷基)苯并[1,3]二噁烷。还描述了利用上述方法获得的新苯二噁烷。该发明的工艺简单,对环境影响小;它允许以高产率获得具有相当兴趣的衍生物,特别是对香料工业和杀虫剂领域而言。