Domino Suzuki coupling and condensation reaction: an efficient strategy towards synthesis of phenanthridines
作者:Munmun Ghosh、Atiur Ahmed、Raju Singha、Jayanta K. Ray
DOI:10.1016/j.tetlet.2014.11.092
日期:2015.1
A short and convenient hetero-annulation protocol has been developed for the synthesis of substituted phenanthridines via domino Suzuki coupling and condensation between N-(2-iodo-aryl)-formamide derivatives and 2-formylphenylboronic acid in the presence of Pd(OAc)2, Cs2CO3 and PPh3 as catalytic system in dry DMF at 85–90 °C for 6–7 h. The intermediate after Suzuki coupling and deprotection of nitrogen
已经开发了一种短而方便的异环合成方案,用于在Pd(OAc)2存在下通过多米诺Suzuki偶联和N-(2-碘-芳基)-甲酰胺衍生物与2-甲酰基苯基硼酸之间的缩合合成取代的菲啶。,Cs 2 CO 3和PPh 3作为干燥DMF在85–90°C下反应6–7 h的催化体系。在相同的催化系统下,铃木偶联和氮脱保护后的中间体,在立即缩合和脱水后,便以高收率提供了相应的菲啶。
Experimental assessment of the efficacy of sensitised emission in water from a europium ion, following intramolecular excitation by a phenanthridinyl group
作者:Ian M. Clarkson、Andrew Beeby、James I. Bruce、Linda J. Govenlock、Mark P. Lowe、Ce´line E. Mathieu、David Parker、Kanthi Senanayake
DOI:10.1039/b001319f
日期:——
The overall quantum yields for phenanthridinium sensitised emission from a europium ion have been measured in H2O and D2O for a series of five structurally related, octadentate ligands in which the distance from the
phenanthridinium chromophore to the Eu ion varies from 2.5 to ca. 8.2 Å. Overall quantum yields (pD⩽2) range from 0.25 to 0.012 suggesting that the experimental distance for 50% efficiency of intramolecular energy transfer lies close to 5.5 Å for this system.
5-exo cyclisation regiospecifically. A competitive 1,5-hydrogen shift leading to imidoyl radicals was noticed. An analogous behaviour is also exhibited by vinyl radicals when allowed to add to carbon-nitrogendouble bonds.