The coupling reaction of a D-ribofuranosyl fluoride with indoles in the presence of boron trifluoride gives the corresponding C-nucleosides in a stereoselective manner depending upon reaction temperatures and solvents: the β-anomer is preferred under such conditions as –15 to –40 °C in nitroethane while the α-anomer is preferred at –78 °C in propiononitrile.
D-
呋喃核糖基
氟化物与
吲哚在
三氟化硼存在下进行偶联反应,根据反应温度和溶剂以立体选择性方式生成相应的 C-核苷:在 –15 至 –40 ° 的条件下优选 β-端基异构体C 在
硝基乙烷中,而 α-端基异构体优选在 –78 °C 在
丙腈中。