Photocyclization of enamides. XXVI Photochemical synthesis of yohimban, epiyohimban, and alloyohimban, basic skeletal structures of yohimbine- and reserpine-type alkaloids.
Photocyclization of two enamides (2a and 2b) has provided a new entry for the construction of three yohimbans, yohimban (5a), epiyohimban (5b), and alloyohimban (5c), which are basic structures of yohimbine- and reserpine-type alkaloids.
Base-promoted aerobic oxidation of <i>N</i>-alkyl iminium salts derived from isoquinolines and related heterocycles
作者:Li-Gang Bai、Yue Zhou、Xin Zhuang、Liang Zhang、Jian Xue、Xiao-Long Lin、Tian Cai、Qun-Li Luo
DOI:10.1039/c9gc03629f
日期:——
scope, low cost, feasibility of scale up, wide availability of reagents, and green reaction conditions, this method shows great potential for preparing isoquinolones and related compounds. The method was applied for atom- and step-economical total synthesis of natural products such as norketoyobyrine.