申请人:Mitsubishi Chemical Industries, Ltd.
公开号:US04594438A1
公开(公告)日:1986-06-10
A process for preparing 2,2-dimethyl-2,3-dihydro-7-hydroxybenzofuran, which comprises (a) heating a 2,2-dihalo-6-halo-6-(1-haloisobutyl)cyclohexanone in the presence of a dehydrohalogenation agent, hydroylzing the resulting 2-isobutenyl-6-halophenol in the presence of a copper compound catalyst and an alkali, and cyclizing the resulting 1,2-dihydroxy-3-isobutenylbenzene in the presence of a cyclization catalyst, (b) heating a 2,2-dihalo-6-halo-6-(1-haloisobutyl) cyclohexanone in the presence of a dehydrohalogenation agent, reacting the resulting 2,2-dimethyl-2,3-dihydro-7-halobenzofuran with at least one metal selected from the group consisting of lithium, sodium and magnesium, oxidizing the resulting metal compound, and hydrolyzing the oxidized metal compound, or (c) heating a 2,2-dihalo-6-halo-6-(1-haloisobutyl) cyclohexanone in a carboxylic acid in the presence of a salt of a carboxylic acid.
制备2,2-二甲基-2,3-二氢-7-羟基苯并呋喃的方法,包括(a)在去卤化剂存在下加热2,2-二卤代-6-卤代-6-(1-卤异丁基)环己酮,使其脱卤素,然后在铜化合物催化剂和碱的存在下水解得到2-异丁烯基-6-卤代酚,最后在环化催化剂的存在下使其环化为1,2-二羟基-3-异丁烯基苯。(b)在去卤化剂存在下加热2,2-二卤代-6-卤代-6-(1-卤异丁基)环己酮,使其脱卤素,然后与锂、钠和镁中的至少一种金属反应,氧化所得的金属化合物,最后水解氧化的金属化合物。(c)在羧酸盐的存在下,在羧酸中加热2,2-二卤代-6-卤代-6-(1-卤异丁基)环己酮。