Catalytic Selective Cyclizations of Aminocyclopropanes: Formal Synthesis of Aspidospermidine and Total Synthesis of Goniomitine
作者:Filippo De Simone、Jürg Gertsch、Jérôme Waser
DOI:10.1002/anie.201001853
日期:——
Mild control: Selectivecyclization of aminocyclopropanes at either the N1 or C3 position of an indole ring was achieved by tuning the reaction conditions (see scheme). This strategy was applied to the formalsynthesis of aspidospermidine and the totalsynthesis of goniomitine, which demonstrated significant cytotoxicity against several tumor cell lines (IC50=150–400 nM). Cbz=benzyloxycarbonyl, Ts=4‐toluenesulfonyl
温和的控制:通过调节反应条件(参见方案),可实现氨基环丙烷在吲哚环的N1或C3位置的选择性环化。该策略适用于蛇毒精的正式合成和古霉素的总合成,对多种肿瘤细胞系均表现出显着的细胞毒性(IC 50 = 150–400 n M)。Cbz =苄氧羰基,Ts = 4-甲苯磺酰基
Regioselective Inter- and Intramolecular Formal [4+2] Cycloaddition of Cyclobutanones with Indoles and Total Synthesis of (±)-Aspidospermidine
way: A formal [4+2] cycloaddition between various cyclobutanones and indoles proceeded efficiently under Lewis acid catalysis (see scheme; PG = protecting group). The regioselectivity of the reaction could be controlled in such a way that each of the two possible regioisomers of a cycloaddition product could be synthesized selectively. The usefulness of this reaction for the total synthesis of hydrocarbazole
Nature's beauty: The first totalsynthesis of the alkaloid natural product jerantinineE is based on a selective cyclization of an aminocyclopropane. Preliminary investigations show that it inhibits the polymerization of tubulin, displaying significant cytotoxicity and antimigratory activity against both breast and lung cancer cell lines.