The reaction of tert-butyl 2-(2-hydroxytetrahydrofuran-2-yl)acetates with alkenes in the presence of 2 equivalents of cerium(IV) ammonium nitrate (CAN) is presented. 2,3,7,8-Tetrahydrofuro[3,2-c]oxepin-4(6H)-ones were formed in moderate to fair yields via 3+2-type dihydrofuran formation, followed by lactonization.
介绍了 2-(
2-羟基四氢呋喃-2-基)
乙酸叔丁酯与烯烃在 2 等量的
硝酸铈(IV)
铵 (CAN) 存在下的反应。通过 3+2 型二氢
呋喃的形成,然后进行内酯化反应,生成了 2,3,7,8-
四氢呋喃并[3,2-c]
氧杂卓-4(6H)-酮,收率中等至相当高。