The Allylic Rearrangement. II. Reactions of 5,5,5-Trichloro-3-penten-2-one with Nucleophiles
作者:Akira Takeda、Sadao Tsuboi、Takashi Moriwake、Eiji Hirata
DOI:10.1246/bcsj.45.3685
日期:1972.12
Reactions of 5,5,5-trichloro-3-penten-2-one (1) with a number of nucleophiles have been carried out. It was found that the Grignard reagents (5) primarily attacked the carbonyl carbon of 1 yielding the corresponding tertiary alcohols (7). The reaction sequence of ethylmagnesium bromide (5a) is given as an example. The reaction of 5a with 1 gave 6,6,6-trichloro-3-methyl-4-hexen-3-ol (7a) as the major
5,5,5-trichloro-3-penten-2-one (1) 与许多亲核试剂的反应已经进行。发现格氏试剂 (5) 主要攻击 1 的羰基碳,产生相应的叔醇 (7)。以乙基溴化镁(5a)的反应顺序为例。5a 与 1 的反应得到 6,6,6-trichloro-3-methyl-4-hexen-3-ol (7a) 作为主要产物的主要成分。通过在蒸馏温度 (88–90°C/6 mmHg) 下加热,己烯醇 7a 很容易发生烯丙基重排,得到 4,6,6-三氯-3-甲基-5-己烯-3-醇 (8a),它是依次通过甲醇钠处理转化为 6,6-二氯-3-甲基-3,4-环氧-5-己烯 (9a)。dl-erythro-4,6,6-trichloro-3-methyl-5-hexen-3-ol (8a-I) 的立体选择性合成是通过使用 3,5, 5-trichloro-4-penten-2-one (3) 作为原料代替