PROCESS FOR PREPARING 6-ISOPROPENYL-3-METHYL-9-DECENYL ACETATE, AND INTERMEDIATES THEREFOR
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:US20220017447A1
公开(公告)日:2022-01-20
The present invention provides a process for preparing 6-isopropenyl-3-methyl-9-decenyl acetate (5): wherein Ac represents an acetyl group, the process comprising steps of: subjecting a 2-methyl-2,6-heptadiene compound (1) having a leaving group X at position 1: wherein X represents an acyloxy group having 1 to 10 carbon atoms including the carbon atom of the carbonyl group, an alkanesulfonyloxy group having 1 to 10 carbon atoms, an arenesulfonyloxy group having 6 to 20 carbon atoms, or a halogen atom, to a nucleophilic substitution reaction with a 3-methylpentyl nucleophilic reagent (2) having a protected hydroxyl group at position 5: wherein M represents Li, MgZ
1
, ZnZ
1
, Cu, CuZ
1
, or CuLiZ
1
, wherein Z
1
represents a halogen atom or a CH
2
CH
2
CH(CH
3
)CH
2
CH
2
OR group, and R represents a protecting group for a hydroxyl group, to form a 6-isopropenyl-3-methyl-9-decene compound (3) having a protected hydroxyl group at position 1: wherein R is as defined above; subjecting the 6-isopropenyl-3-methyl-9-decene compound (3) having the protected hydroxyl group at position 1 to a deprotection reaction to form 6-isopropenyl-3-methyl-9-decenol (4); and acetylating 6-isopropenyl-3-methyl-9-decenol (4) to form 6-isopropenyl-3-methyl-9-decenyl acetate (5).
本发明提供了一种制备6-异丙烯基-3-甲基-9-癸烯基醋酸酯(5)的方法:其中Ac代表乙酰基,该方法包括以下步骤:将在位置1具有一个离去基X的2-甲基-2,6-庚二烯化合物(1)进行亲核取代反应,其中X代表一个含有1至10个碳原子的乙酰氧基,一个含有1至10个碳原子的烷基磺酰氧基,一个含有6至20个碳原子的芳基磺酰氧基,或一个卤素原子;与在位置5具有被保护羟基的3-甲基戊基亲核试剂(2)进行亲核取代反应,其中M代表Li、MgZ1、ZnZ1、Cu、CuZ1或CuLiZ1,其中Z1代表卤素原子或CH2CH2CH(CH3)CH2CH2OR基团,R代表羟基的保护基团,形成具有在位置1处保护羟基的6-异丙烯基-3-甲基-9-癸烯化合物(3);将具有在位置1处保护羟基的6-异丙烯基-3-甲基-9-癸烯化合物(3)进行去保护反应,形成6-异丙烯基-3-甲基-9-癸烯醇(4);将6-异丙烯基-3-甲基-9-癸烯醇(4)醋酰化,形成6-异丙烯基-3-甲基-9-癸烯基醋酸酯(5)。