Intramolekulare Aromatenalkylierungen, 18. Mitt. Synthese von 3,4-Dihydro-1′-methylspiro[naphthalin-1(2H), 4′-piperidinen]
摘要:
AbstractAus den Tetrahydropyridinen 10 entstehen in siedender Bromwasserstoffsäure stereoselektiv die Titelverbindungen 12, deren Struktur und Konfiguration durch NMR‐Spektroskopie und Röntgenstrukturanalyse bewiesen wird. Die Vorstufen 10 werden aus den Pyridincarbonitrilen 5 und den Grignardreagenzien 6 nach Standardverfahren gewonnen.
Intramolekulare Aromatenalkylierungen, 18. Mitt. Synthese von 3,4-Dihydro-1′-methylspiro[naphthalin-1(2H), 4′-piperidinen]
摘要:
AbstractAus den Tetrahydropyridinen 10 entstehen in siedender Bromwasserstoffsäure stereoselektiv die Titelverbindungen 12, deren Struktur und Konfiguration durch NMR‐Spektroskopie und Röntgenstrukturanalyse bewiesen wird. Die Vorstufen 10 werden aus den Pyridincarbonitrilen 5 und den Grignardreagenzien 6 nach Standardverfahren gewonnen.
A Lewis Base Catalysis Approach for the Photoredox Activation of Boronic Acids and Esters
作者:Fabio Lima、Upendra K. Sharma、Lars Grunenberg、Debasmita Saha、Sandra Johannsen、Joerg Sedelmeier、Erik V. Van der Eycken、Steven V. Ley
DOI:10.1002/anie.201709690
日期:2017.11.20
either boronic acids or esters. This system enabled a wide range of alkyl boronic esters and aryl or alkyl boronic acids to react with electron-deficient olefins via radical addition to efficiently form C-C coupled products in a redox-neutral fashion. The Lewis base catalyst was shown to form a redox-active complex with either the boronic esters or the trimeric form of the boronic acids (boroxines) in
Nickel-catalysed para-CH activation of pyridine with switchable regioselective hydroheteroarylation of allylarenes
作者:Wei-Chih Lee、Chien-Hung Chen、Cheng-Yuan Liu、Ming-Shiuan Yu、Yung-Huei Lin、Tiow-Gan Ong
DOI:10.1039/c5cc07455j
日期:——
para-CH activation of pyridine with allylbenzene is described by Ni/Al cooperative catalysis to achieve branch and linear selectivity.
使用Ni/Al协同催化描述了烯丙基苯与吡啶的para-CH活化,以实现支链和线性选择性。
Ruthenium catalyzed β-selective alkylation of vinylpyridines with aldehydes/ketones <i>via</i> N<sub>2</sub>H<sub>4</sub> mediated deoxygenative couplings
作者:Leiyang Lv、Chao-Jun Li
DOI:10.1039/d0sc06586b
日期:——
aldehyde/ketones via N2H4 mediated deoxygenative couplings. Compared with one-electron umpolung of carbonyls to alcohols, this two-electron umpolung strategy realized reductive deoxygenation targets, which were not only applicable to the regioselective alkylation of a broad range of 2/4-alkene substituted pyridines, but also amenable to challenging 3-vinyl and steric-embedded internal pyridines as well as their
Continuous UV-Flow Microsystem for Efficient Radical Generation from Organotrifluoroborates by Photoredox Catalysis
作者:Nassim El Achi、Maël Penhoat、Youssef Bakkour、Christian Rolando、Laëtitia Chausset-Boissarie
DOI:10.1002/ejoc.201600728
日期:2016.9
An efficient continuous-flow protocol for C–O and C–C bond formation fromorganoborates by photoredoxcatalysis under UV irradiation was explored. The combination of a cyclometalated iridium photocatalyst, high-power UV light-emitting diode irradiation, and microreactor technology resulted in very efficient radicalgeneration. The flow device enabled determination of highly accurate kinetic data that