An enantiocontrolled route to the 19-oxygenated pentacyclic Strychnos alkaloids has been demonstrated by the stereoselective synthesis of (−)-19(S)-acetoxy-N1-acetyl-20-epitubifolidine
                                    一个enantiocontrolled路线19充氧五环马钱子
生物碱已经证明通过的立体选择性合成( - ) - 19(小号)乙酰氧基Ñ 1 -乙酰基20-epitubifolidine