作者:YOSHIAKI FURUYA、YOSHIO KOSUGI、KAZUO ITOHO、KAZUKI YAMAGUCHI、TOSHIHIRO NAKASHIMA、TAKASHI MURAYAMA、YOSHITAKA MAEDA
DOI:10.1248/cpb.30.2424
日期:1982.7.25
When mixed with methanol containing a catalytic amount of sulfuric acid and kept at 10°C for 10 h, benzoylacetone (BA) gave two products methoxylated on the side of the acetyl group (viz., 3, 3-dimethoxy-1-phenyl-1-butanone (AK) and 3-methoxy-1-phenyl-2-buten-1-one (A'E)) but no products methoxylated on the side of the benzoyl group (4, 4-dimethoxy-4-phenyl-2-butanone (BK) and 4-methoxy-4-phenyl-3-buten-2-one (B'E)) or products methoxylated on both carbonyls. Furthermore, BA did not undergo acid-catalyzed methanolysis under our conditions. The reason why acetal formation of the acetyl carbonyl occurs more easily than that of the benzoyl carbonyl, and the relationship of AK and A'E, which is not an intermediate in the formation of AK from BA even though AK can be formed from it, are discussed.
当苯甲酰乙酮(BA)与含有催化量硫酸的甲醇混合,并在10°C下保持10小时时,产生了两种在乙酰基侧甲氧基化的产物(即3,3-二甲氧基-1-苯基-1-丁酮(AK)和3-甲氧基-1-苯基-2-丁烯-1-酮(A'E)),但没有产生在苯甲酰基侧甲氧基化的产物(4,4-二甲氧基-4-苯基-2-丁酮(BK)和4-甲氧基-4-苯基-3-丁烯-2-酮(B'E))或在两个羰基上都甲氧基化的产物。此外,在我们的条件下,BA并没有经历酸催化的甲醇解反应。本文讨论了乙酰基羰基的缩醛形成比苯甲酰基羰基更容易形成的原因,以及AK和A'E之间的关系,尽管AK可以从A'E形成,但A'E并不是从BA形成AK的中间体。