Manganese(III) acetate based oxidative cyclizations of 3-oxopropanenitriles with conjugated alkenes and synthesis of 4,5-dihydrofuran-3-carbonitriles containing heterocycles
作者:Mehmet Yılmaz、Nese Uzunalioglu、A. Tarık Pekel
DOI:10.1016/j.tet.2005.07.019
日期:2005.9
obtained through oxidative cyclizations of 3-oxo-3-phenylpropanenitrile 1a, 3-oxo-3-thien-2-ylpropanenitrile 1b, 3-(2-furyl)-3-oxopropanenitirle 1c, 3-(1-benzofuran-2-yl)-3-oxopropanenitrile 1d, and 4,4-dimethyl-3-oxopropanenitrile 1e mediated manganese(III) acetate with 1,1-diphenyl-1-butene 2a and 1,2-diphenyl-1-pentene 2b. The treatments of these 3-oxopropanenitriles with 2-thienyl substituted alkenes
通过3-氧代-3-苯基丙腈1a,3-氧代-3-噻吩-2-基丙腈1b,3-(2-呋喃基)-3-的氧化环化反应获得了4,5-二氢呋喃-3-腈3a – i。氧丙烷丙烷1c,3-(1-苯并呋喃-2-基)-3-氧丙烷腈1d和4,4-二甲基-3-氧丙烷腈1e介导的乙酸锰(III)与1,1-二苯基-1-丁烯2a和1 ,2-二苯基-1-戊烯2b。用2-噻吩基取代的烯烃,例如2-[((E)-2-苯基乙烯基]噻吩2c,2-[(E)-1-甲基-2-苯基乙烯基]噻吩)处理这些3-氧代丙烷腈。2d和2-(1-苯基乙烯基)噻吩2e形成5-(2-噻吩基)-4,5-二氢呋喃-3-腈3j – r,收率高(45–93%)。结果,2-噻吩基取代的烯烃比苯基取代的衍生物以更高的产率形成产物。