Synthesis of Aristotelia-Type Alkaloids. Part XII. Total synthesis of (−)-tasmanine. Stereoelectronic factors that control the rearrangement of 3H-indol-3-ol derivatives to oxindoles ( = 1,3-dihydro-2H-indol-2-ones) or to pseudoindoxyls ( =1,2-dihydro-3H-
作者:Rolf Güller、Hans-Jürg Borschberg
DOI:10.1002/hlca.19930760505
日期:1993.8.11
The oxidative transformation of (+)-aristoteline ((+)-5) into its metabolites, the recently synthesized indole alkaloids (−)-serratoline ((−)-6), (+)-aristotelone ((+)-2), and (−)-alloaristoteline ((−)-22), was investigated in more detail. It was demonstrated that the diastereoface selectivity of the reaction of (+)-5 with 3-chloroperbenzoic acid can be altered by variation of the solvent as well as
(+)-马兜铃啉((+)- 5)的氧化转化为代谢产物,即最近合成的吲哚生物碱(-)-塞拉托林((-)- 6),(+)-马兜铃酮((+)- 2) ,和(-)-别石蒜碱((-)- 22),进行了更详细的研究。已经证明,(+)- 5与3-氯过苯甲酸的反应的非对映体选择性可以通过改变溶剂以及通过添加CF 3 COOH来改变。中间体3 H-吲哚-3-醇衍生物的1,2-重排的化学选择性可通过以下方式控制:3 H的处理-吲哚-3-醇与多磷酸水溶液可生成假吲哚基(= 1,2-二氢-3 H-吲哚-3-酮)衍生物,而对相应的O-苯甲酸酯的类似处理仅提供了相应的结构异构2-氧吲哚(= 1,3-二氢-2 H-吲哚-2-一)产物。导致的有效全合成的这些和相关的研究结果开发Aristotelia生物碱( - ) - tasmanine(( - ) - 1)和相应的非天然差向异构体的(+) - 12,以及两个pseudoindoxyls的(+)