A new bicyclic oxazaborines with a bridged nitrogen atom, their thermic rearrangement and fluorescence properties
作者:František Josefík、Markéta Svobodová、Valerio Bertolasi、Petr Šimůnek、Vladimír Macháček、Numan Almonasy、Eva Černošková
DOI:10.1016/j.jorganchem.2011.11.004
日期:2012.2
Cyclic beta-enaminones bearing secondary amino group react with 4-substituted benzenediazonium tetraphenylborates in dichloromethane to form substituted bicyclic [1,3,2 lambda(4)] oxazaborines The oxazaborines rearrange, on heating to 200 degrees C in the absence of solvent or in DMF or DMSO, to isomeric 2H-[1,2,4,3 lambda(4)] triazaborines. Previously prepared [1,3,2 lambda(4)] oxazaborines derived from acyclic beta-enaminones bearing secondary amino group either did not undergo the rearrangement or with a lot of difficulties and with negligible yield. The fluorescence behaviour of the prepared triazaborines was observed. These compounds fluoresce in 2-methyltetrahydrofurane and in solid state under low temperatures. (C) 2011 Elsevier B.V. All rights reserved.