Oxidation of diethyl ω-phenylalkenylmalonates by high valent metal salts.
作者:Attilio Citterio、Roberto Sebastiano、Marco Nicolini
DOI:10.1016/s0040-4020(01)87248-3
日期:1993.8
The oxidation of diethyl ω-phenylalkenylmalonates by Mn(III) acetate in acetic acid and Fe(III) perchlorate nonahydrate in acetonitrile or acetonitrile/acetic anhydride is investigated. Diethyl cinnamylmalonates 1, 2 and 3 afford intramolecular addition products to the double bond (cyclopropanes 10) and to the aromatic ring (tetrahydronaphthalenes 8 or 9). A mechanism based on a fast and reversible
研究了乙酸Mn(III)在乙酸中和高氯酸Fe(III)九水合在乙腈或乙腈/乙酸酐中对ω-苯基烯基丙二酸二乙酯的氧化作用。二cinnamylmalonates 1,2和3得到的分子内的加成产物的双键(环丙烷10)并和该芳香环(四氢萘8或9)。基于快速的和可逆的3-机制外-trig公司丙二酰自由基导致的-addition顺反建议平衡双键,然后进行苄基自由基的氧化和分子内芳族取代之间的竞争。用苯乙烯和金属离子进行的捕集实验阐明了所涉及的一些动力学参数。同样,化合物4和5被Mn(III)/ AcOH和FEP / AN氧化为4-和5- exo-trig-环化产物。与此相反,外球电子转移机制建议在氧化1,4和5在由FEP / AN-AC苯乙烯双键2 O和benzalketones的6和7的Mn(III)/ AcOH中,以α氧合产物21–22。