申请人:——
公开号:US20040030193A1
公开(公告)日:2004-02-12
A method of making a 3-alkylcycloalkanol of formula 2: where R
1
represents a methyl or ethyl group, R
2
represents hydrogen, R
3
represents an ethyl, propyl, butyl, isobutyl or isoamyl group, R
4
represents hydrogen and R
5
represents hydrogen, or a methyl, ethyl, propyl, isobutyl or isoamyl group comprises the following steps: (1) carrying out an electrophilic substitution reaction of an alkyl group or precursor thereof, on an ortho-substituted alkylbenzene compound of formula 3: where R
6
represents hydrogen, or a methyl or ethyl group; (2) hydrogenating the reaction product of step (1); (3) performing an elimination reaction on one or more reaction products of step (2) to produce one or more alkene products; and (4) hydrating the one or more alkene products of step (3) to provide a 3-alkylcycloalkanol of formula 2. The electrophilic substitution reaction of step (1) may be a Friedel-Crafts acylation, e.g. using an isopropyl ketone precursor, or a Friedel-Crafts alkylation, e.g. using an isobutyl group. The 3-alkylcycloalkanols, especially 3-(2-methylpropyl)-1-methylcyclohexanol, are useful fragrance materials and find use in perfumes and perfumed products.
一种制备式为2的3-烷基环烷醇的方法:其中R1代表甲基或乙基基团,R2代表氢,R3代表乙基、丙基、丁基、异丁基或异戊基基团,R4代表氢,R5代表氢或甲基、乙基、丙基、异丁基或异戊基基团,包括以下步骤:(1)在式为3的邻位取代烷基苯化合物上进行烷基或其前体的亲电取代反应,其中R6代表氢、甲基或乙基基团;(2)对步骤(1)的反应产物进行氢化;(3)对步骤(2)的一个或多个反应产物进行消除反应,得到一个或多个烯烃产物;(4)对步骤(3)的一个或多个烯烃产物进行水合反应,以提供式为2的3-烷基环烷醇。步骤(1)的亲电取代反应可以是Friedel-Crafts酰化反应,例如使用异丙基酮前体,或Friedel-Crafts烷基化反应,例如使用异丁基基团。3-烷基环烷醇,特别是3-(2-甲基丙基)-1-甲基环己醇,是有用的香料材料,可用于香水和带香产品中。