Mechanistic Aspects of Thiyl Radical-Promoted Acyl Radical Cyclization of Formylenoate-Cyclization versus Oxidation
作者:Kazuya Yoshikai、Tomoharu Hayama、Katsumi Nishimura、Ken-ichi Yamada、Kiyoshi Tomioka
DOI:10.1248/cpb.53.586
日期:——
Treatment of formylalkenoates 1 and 7 with 2,2′-azobis(2-methylpropanenitrile) (AIBN) in the presence of dioxygen gave oxygenated carboxylic acids 5, 6, 8, 9 instead of acyl radical cyclization products, through preferential reaction of the corresponding acyl radicals with dioxygen rather than intramolecular attack to an enoate moiety. The reaction of 1 with AIBN in the absence of dioxygen recovered starting 1 in 98% yield.
在分子氧存在下,用 2,2'-偶氮二(2-甲基丙腈) (AIBN) 处理甲酰基烯酸酯 1 和 7,通过相应的优先反应,得到含氧羧酸 5,6,8,9,而不是酰基自由基环化产物。酰基自由基与双氧而不是分子内攻击烯酸部分。 1 与 AIBN 在无分子氧存在下反应,以 98% 的产率回收起始物 1。