One-Pot Synthesis of Spirofuran and Benzocycloalka[1,2-<i>b</i>]furan Derivatives Using Manganese(III)-Mediated Oxidative Radical Cyclization
作者:Hiroshi Nishino、Reika Fujino
DOI:10.1055/s-2005-861807
日期:——
obtained by the oxidation of methylenebenzocycloalkanes with manganese(III) acetate in the presence of 1,3-dicarbonyl compounds. A similar oxidation of the benzocycloalkene derivatives produced the functionalized benzocycloalka[1,2-b]furans in good yields. However, l-benzyl-3,4-dihydronaphthalene gave both the corresponding spirofuran and benzocyclohexa[1,2-b]furan under the same oxidation conditions.
新的螺[furan-2(3H),1'-(benzocycloalkane)] 衍生物是通过在1,3-二羰基化合物存在下用乙酸锰(III) 氧化亚甲基苯并环烷烃获得的。苯并环烯烃衍生物的类似氧化以良好的收率产生了官能化的苯并环烷[1,2-b]呋喃。然而,l-benzyl-3,4-dihydronaphthalene 在相同的氧化条件下得到相应的螺呋喃和苯并环己[1,2-b]呋喃。还研究了螺呋喃和苯并环烷[1,2-b]呋喃的酸催化开环反应。