Synthesis of Ellipticine: A Radical Cascade Protocol to Aryl- and Heteroaryl-Annulated[b]carbazoles
摘要:
Imidoyl selanides, synthesized from amides, have been used as radical precursors of imidoyl radicals in cascade reactions. The novel radical cascade has been developed for the simple synthesis of the medicinally important aryl-annulated[b]-carbazoles. The protocol has been exemplified with the high-yielding total synthesis of the anticancer alkaloid ellipticine.
Intramolecular diels-alder cycloadditions of vinylketenimines. A convergent route to carbazoles and pyridocarbazole alkaloids
作者:Edmond Differding、Léon Ghosez
DOI:10.1016/s0040-4039(00)98574-5
日期:1985.1
The intramolecularDiels-Aldercycloaddition of acetylenic vinylketenimines is the key step of a highly convergent synthesis of carbazoles. A facile synthesis of N-methyl-tetrahydroellipticine has been completed in five isolated steps from N-methyl piperidone.
transformation of a wide variety of alcohols or carboxylic acids into the corresponding halides. Yields are high and conditions are very mild thus allowing for the presence of sensitive functional groups. The reagents can be easily tuned allowing therefore the selective monohalogenation of polyhydroxylated molecules. The scope and chemoselectivity of the reactions have been studied and reaction mechanisms
Bio-Inspired Fragmentations: Rapid Assembly of Indolones, 2-Quinolinones, and (−)-Goniomitine
作者:Haokun Li、Peng Cheng、Long Jiang、Jin-Liang Yang、Liansuo Zu
DOI:10.1002/anie.201611830
日期:2017.3.1
goniomitine, new synthetic bio‐inspired fragmentation strategies for the synthesis of functionalized 2‐quinolinones and indolones have been developed. Remarkable synthetic efficiency was achieved by telescoping several transformations into one‐pot reactions, allowing for the direct coupling of 2‐alkynyl‐anilines and diazo ketones. The synthetic utility was demonstrated by the 5‐step asymmetric total synthesis
Exploiting the Divergent Reactivity of Isocyanoacetates: One-Pot Three-Component Synthesis of Functionalized Angular Furoquinolines
作者:Marinus J. Bouma、Géraldine Masson、Jieping Zhu
DOI:10.1002/ejoc.201101567
日期:2012.1
moderate to excellent yields. Mechanistically, the three-component reaction of 2, 3, and 4 leading to 5-alkoxyoxazoles was followed by a domino sequence involving Diels-Alder/retroDiels-Alder/oxidation reactions. In this one-pot process, five chemical bonds were created with concurrent formation of two heterocyclic rings. The reaction was performed under thermal conditions and no external reagent was