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Collective formal synthesis of (±)-rhynchophylline and homologues

机译:集体正式合成(±)-Rhynchophylline和同源物

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A collective formal synthesis approach to bioactive oxindole alkaloids, including (±)-rhynchophylline, (±)-isorhynchophylline, (±)-mitraphylline, (±)-formosanine, (±)-isomitraphylline, and (±)-isoformosanine, is completed in a protecting-group free manner. Besides multigram-scaled operations, the notable feature of the synthesis is the application of two one-pot, sequential transformations. Namely, two key tetracyclic intermediates pyridinium salt 9 and monoester 14 were prepared by a one-pot N -alkylation/cross-dehydrogenative coupling sequence and a one-pot Michael/Karpocho sequence with minimal purification, respectively.
机译:对生物活性氧吲哚生物碱的集体形式合成方法,包括(±)-RHYNCHOPHYLLINE,(±)-ISORHOHOPHOPHELLLINE,(±)-MITRAphylline,(±)-(±)-ISOMITRAphylline,(±)-ISOMITOMITALLLINE,(±)-ISOMORATHLLINE完成以保护群体自由方式。除了多书缩放的操作外,合成的显着特征是应用两个单罐的顺序变换。即,通过单壶N-烷基化/交酯脱氢偶联序列和单盆迈克尔/ karpocho序列,分别具有纯化纯化的一锅迈克尔/ karpocho序列来制备两个关键四环盐9和单酯14。

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