-
公开(公告)号:US06900359B2
公开(公告)日:2005-05-31
申请号:US10344531
申请日:2001-08-10
IPC分类号: C07B61/00 , C07C1/20 , C07C1/24 , C07C13/19 , C07C13/20 , C07C29/04 , C07C29/132 , C07C29/20 , C07C35/08 , C07C41/18 , C07C41/20 , C07C43/184 , C07C45/45 , C07C45/46 , C07C45/82 , C07C49/84 , C11B9/00 , C07L35/08
CPC分类号: C07C29/04 , C07C29/20 , C07C35/08 , C07C45/46 , C07C45/82 , C07C49/84 , C07C2601/14 , C11B9/0034
摘要: A method of making a 3-alkylcycloalkanol of formula 2: where R1 represents a methyl or ethyl group, R2 represents hydrogen, R3 represents an ethyl, propyl, butyl, isobutyl or isoamyl group, R4 represents hydrogen and R5 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 R6 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.
摘要翻译: 制备式2的3-烷基环烷醇的方法:其中R 1表示甲基或乙基,R 2表示氢,R 3, 代表乙基,丙基,丁基,异丁基或异戊基,R 4表示氢,R 5表示氢,或甲基,乙基,丙基,异丁基或异戊基包括 以下步骤:(1)在式3的邻位取代的烷基苯化合物上进行烷基或其前体的亲电取代反应:其中R 6表示氢,或甲基或乙基 组; (2)氢化步骤(1)的反应产物; (3)对步骤(2)的一种或多种反应产物进行消除反应以产生一种或多种烯烃产物; (4)将步骤(3)的一种或多种烯烃产物水合以提供式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,例如。 使用异丁基。 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,可用于香料和香料产品中。