New synthesis of 2,6-anhydro-β-d-fructofuranoses, pivotal [2.2.1] bicyclic acetals for the conversion of d-fructose into 2,2,5-trisubstituted tetrahydrofurans
作者:Fabrice Goursaud、Frédéric Peyrane、Alain Veyrières
DOI:10.1016/s0040-4020(02)00233-8
日期:2002.4
tin-promoted 2,5-cyclisation of phenyl 2-thio-β-d-fructopyranosides. They were regioselectively opened by allyltrimethylsilane in the presence of catalytic Sc(OTf)3 to give 2,2,5-trisubstituted tetrahydrofurans in high yields and major α-stereoselectivity.
通过新颖的锡促进苯基2-硫代-β-d-果糖吡喃糖苷的2,5-环化反应来制备2,6-脱水-β-d-果糖呋喃糖衍生物。它们在催化的Sc(OTf)3存在下被烯丙基三甲基硅烷区域选择性地打开,从而以高收率和主要的α-立体选择性得到2,2,5-三取代的四氢呋喃。