Total synthesis of (−)-indolizidine 167B via an unusual Wolff rearrangement from an α,β-unsaturated diazoketone
作者:Vagner D. Pinho、Antonio C.B. Burtoloso
DOI:10.1016/j.tetlet.2011.12.029
日期:2012.2
A concise synthesis of the (−)-indolizidine alkaloid 167B and two formal syntheses of (−)-indolizidine 209D and (−)-coniceine are described in just three steps from an α,β-unsaturated diazoketone, via an unusual photochemical Wolff rearrangement. Preparation of the unsaturated diazoketone is straightforward from N-Cbz-prolinal and a 3-diazo-2-oxopropylphosphonate, employing a Horner–Wadsworth–Emmons
通过不寻常的光化学Wolff重排,从α,β-不饱和重氮酮仅三步描述了(-)-吲哚并立啶生物碱167B的简明合成以及(-)-吲哚并立定209D和(-)-可卡因的两种形式的合成。 。N -Cbz-脯氨酸和3-重氮-2-氧代丙基膦酸酯的制备很简单,采用Horner-Wadsworth-Emmons反应即可制备不饱和重氮酮。该策略应该是可行的,并且很容易适应于其他吲哚并立定生物碱和类似物的合成。