A number of (E)-3-alkylidine-phthalide derivatives have been prepared at room temperature in excellent yields in a one-pot reaction by treating o-alkenylbenzoic acids with meta-chloroperbenzoic acid and para-toluenesulfonic acid. This reaction presumably occurs via domino epoxidation – intramolecular cyclization – acid catalyzed dehydration sequence of reactions. On the other hand, 3-(2-formyl-3,4-dihydro-naphthalen-1-yl)-acrylic acid esters and 3-(2-formyl-3,4-dihydro-naphthalen-1-yl)-acrylonitriles afforded phthalide derivatives under Pinnick reaction conditions involving oxidation-intramolecular Michael addition.
通过用间
氯过
苯甲酸和
对甲苯磺酸处理邻链烯基
苯甲酸,在室温下以优异的产率在一锅反应中制备了许多(E)-3-亚烷基
苯酞衍
生物。该反应可能是通过多米诺骨牌环氧化-分子内环化-酸催化脱
水反应序列发生的。另一方面,3-(2-甲酰基-3,4-二氢
萘-1-基)-
丙烯酸酯和3-(2-甲酰基-3,4-二氢-
萘-1-基)-
丙烯腈在涉及氧化-分子内迈克尔加成的 Pinnick 反应条件下提供了
苯并呋喃衍
生物。