Regioselective synthesis of highly substituted furans via tantalum-alkyne complexes.
作者:Yasutaka Kataoka、Makoto Tezuka、Kazuhiko Takai、Kiitiro Utimoto
DOI:10.1016/s0040-4020(01)88488-x
日期:1992.1
variety of 2,3,4-trisubstituted furans are prepared by treatment of tantalum-alkyne complexes with a aldehydes followed by addition of an isocyanide in DME-PhH-THF (1:1:1). The regioselectivity of the reaction depends on the bulkiness of substituents on a acetylenes and the bulkier substituents tend to possess 4-position of the produced furans. 4-Trialkylsilyl-substitued furans are produced exclusively when
通过用醛处理钽-炔配合物,然后在DME-PhH-THF(1:1:1)中添加异氰酸酯来制备各种2,3,4-三取代的呋喃。反应的区域选择性取决于乙炔上的取代基的体积,并且更大的取代基往往具有所产生的呋喃的4-位。当使用三烷基甲硅烷基乙炔时,仅生产4-三烷基甲硅烷基取代的呋喃。