AbstractKopsinine and related alkaloids are attractive synthetic targets because of their structural complexity and biological activities. An organocatalytic Michael addition/aza‐Michael addition/cyclization cascade sequence has been developed for the enantioselective preparation of tetracyclic spiroindolines from 2,3‐disubstituted indoles and propargyl aldehyde in moderate to good yields and good to excellent enantioselectivities. The synthetic value of these advanced structures has been demonstrated by the synthesis of kopsinine and related alkaloids. Key steps for the concise synthesis of these alkaloids included an efficient enantioselective construction of tetracyclic spiroindolines bearing a dienamino ester moiety and the organocatalyzed nucleophilic addition of a dienamino ester to acrolein.magnified image
Synthesis of azepino[4,5-b]indolones via an intermolecular radical oxidative substitution of N-Boc tryptamine
作者:Paul E. Reyes-Gutiérrez、Rubén O. Torres-Ochoa、Roberto Martínez、Luis D. Miranda
DOI:10.1039/b821260k
日期:——
A two-step protocol for the synthesis of azepino[4,5-b]indolone derivatives featuring a xanthate radical oxidative aromatic substitution on the N-Boc protected tryptamine, using dilauroyl peroxide (DLP) as initiator and oxidant, is described.
使用N- Boc保护的色胺上具有黄药酸酯氧化性芳族取代基的azepino [4,5- b ]吲哚酮衍生物的两步合成方法,使用过氧化二月桂酰 描述了作为引发剂和氧化剂的(DLP)。
Enantioselective Intermolecular Formal [3 + 3] Cycloaddition of 2,3-Disubstituted Indoles with Acrolein
An expedient enantioselective synthesis of highly substituted hydrocarbazoles has been realized by an organocatalyzed formal [3 + 3] cycloaddition between acrolein and 2,3-disubstituted indoles. Tricyclic hydrocarbazoles were obtained from a broad range of 2,3-disubstituted indoles and acrolein in good to excellent yields and excellent enantioselectivites.
Enantioselective Michael/aza-Michael/Cyclization Organocascade to Tetracyclic Spiroindolines: Concise Total Synthesis of Kopsinine and Aspidofractine
作者:Xiaoyu Wu、Jianbiao Huang、Beibei Guo、Long Zhao、Yong Liu、Jie Chen、Weiguo Cao
DOI:10.1002/adsc.201400363
日期:2014.11.3
AbstractKopsinine and related alkaloids are attractive synthetic targets because of their structural complexity and biological activities. An organocatalytic Michael addition/aza‐Michael addition/cyclization cascade sequence has been developed for the enantioselective preparation of tetracyclic spiroindolines from 2,3‐disubstituted indoles and propargyl aldehyde in moderate to good yields and good to excellent enantioselectivities. The synthetic value of these advanced structures has been demonstrated by the synthesis of kopsinine and related alkaloids. Key steps for the concise synthesis of these alkaloids included an efficient enantioselective construction of tetracyclic spiroindolines bearing a dienamino ester moiety and the organocatalyzed nucleophilic addition of a dienamino ester to acrolein.magnified image