Total syntheses of the Strychnos indole alkaloids(−)-tubifoline, (−)-tubifolidine, and (−)-19,20-dihydroakuammicine
作者:Mercedes Amat、M.-Dolors Coll、Joan Bosch、Enric Espinosa、Elies Molins
DOI:10.1016/s0957-4166(97)00071-2
日期:1997.3
Two different stragies for the synthesis of pentacyclic Strychnos alkaloids in enantiomerically pure form are explored. Both of them involve the use of enantiopure 2-(4-piperidylmethyl)indoles prepared by kinetic resolution of 1-(3-pyridyl)ethanol, followed by partial reduction of the pyridine ring to the tetrahydropyridine level, Claisen rearrangement of the resulting allylic alcohol, and finally
为五环的合成两种不同stragies马钱子生物碱在对映体纯的形式进行了探索。它们都涉及使用对映体纯的2-(4-哌啶基甲基)吲哚,其是通过动力学拆分1-(3-吡啶基)乙醇而制备的,然后将吡啶环部分还原成四氢吡啶水平,将所得的烯丙醇进行克莱森重排。 ,最后是史密斯的化身。而2-(4-哌啶基甲基)吲哚6不能转换到的四环ABDE子马钱子碱,氯乙酰胺的photocyclization 14,从(哌啶基甲基)吲哚衍生的13,令人满意地得到stemmadenine型四环15,然后将其转化为生物碱(-)-tubifoline,(-)-tubifolidine和(-)-19,20-dihydroakuammicine。