Palladium-Catalyzed Intramolecular C-H Amination in Water
作者:Lizheng Yang、Hao Li、Haifei Zhang、Hongjian Lu
DOI:10.1002/ejoc.201601043
日期:2016.12
found to be effective for intramolecular C–H amination in water. With 2-azidobiphenyls as substrates, the reaction efficiently provided various carbazoles with N2 as the sole byproduct. The reaction showed high functional-group tolerance and could be used in the synthesis of several natural carbazole alkaloids. The catalytic process was promoted by water, and the reaction was inefficient in the organic
发现钯 (II) 催化对水中的分子内 C-H 胺化有效。以 2-叠氮联苯为底物,该反应有效地提供了各种咔唑,N2 作为唯一的副产物。该反应显示出高官能团耐受性,可用于合成多种天然咔唑生物碱。催化过程受水促进,在所研究的有机溶剂中反应效率低下。
Visible-light-promoted intramolecular C–H amination in aqueous solution: synthesis of carbazoles
作者:Lizheng Yang、Yipin Zhang、Xiaodong Zou、Hongjian Lu、Guigen Li
DOI:10.1039/c7gc03392c
日期:——
An effective and operationally simpleprotocol is reported for the synthesis of versatile carbazoles. With water as a co-solvent, visible-light rather than various metals is used to facilitate the conversion of readily available 2-azidobiphenyls under mild conditions. Various functionalized bioactive natural alkaloids, such as glycoborine, clausine C, clausine L, clausine H and clauszoline K, were
Synthesis of Methylene-Bridged Biscarbazole Alkaloids by using an Ullmann-type Coupling: First Total Synthesis of Murrastifoline-C and Murrafoline-E
作者:Sebastian K. Kutz、Carsten Börger、Arndt W. Schmidt、Hans-Joachim Knölker
DOI:10.1002/chem.201504680
日期:2016.2.12
describe the totalsynthesis of methylene‐bridged biscarbazole alkaloids by using a late‐stage Ullmann‐type coupling of fully functionalised carbazole subunits. The carbazole derivatives were synthesised via a sequence of palladium(0)‐ and palladium(II)‐catalysed coupling reactions. Our approach has provided bismurrayafoline‐A, bismurrayafolinol, chrestifolines B–D, and the firsttotalsynthesis of murrastifoline‐C
C–N bond formation via Cu-catalyzed cross-coupling with boronic acids leading to methyl carbazole-3-carboxylate: synthesis of carbazole alkaloids
作者:Sk. Rasheed、D. Nageswar Rao、K. Ranjith Reddy、S. Aravinda、Ram A. Vishwakarma、Parthasarathi Das
DOI:10.1039/c3ra44903c
日期:——
Copper promoted N-arylation of methyl 4-amino-3-iodobenzoate with boronic acids followed by Pd-catalyzed intramolecular CâH arylation provides an efficient route to methyl carbazole-3-carboxylate derivatives. This methodology was implemented in the synthesis of naturally occurring carbazole alkaloids clausine C, clausine H, clausine L, clausenalene, glycozoline, glycozolidine, glycozolidal and sansoakamine.
Transition Metals in Organic
Synthesis, Part 87: An
Efficient Palladium-Catalyzed Route to 2-Oxygenated and
2,7-Dioxygenated Carbazole Alkaloids - Total Synthesis
of 2-Methoxy-3-methylcarbazole, Glycosinine, Clausine L, Mukonidine,
and Clausine V
Optimization of the palladium(II)-catalyzed oxidative cyclization of N,N-diarylamines opens up the way to an efficient synthesis of 2-oxygenated and 2,7-dioxygenated carbazole alkaloids including 2-methoxy-3-methylcarbazole, glycosinine, clausine L, mukonidine, and clausine V.