Synthesis, Structure and Emission Properties of Spirocyclic Benzofuranones and Dihydroindolones: A Domino Insertion–Coupling–Isomerization– Diels–Alder Approach to Rigid Fluorophores
作者:Daniel M. D'Souza、Alexander Kiel、Dirk-Peter Herten、Frank Rominger、Thomas J. J. Müller
DOI:10.1002/chem.200700759
日期:2008.1.7
far thermodynamically and kinetically favored over a possible Claisen rearrangement. Compounds of this new class of spirocyclic compounds possess large Stokes shifts and fluoresce intensively with blue over green to orange colors. As a consequence of the spirocyclic rigidity fluorescence lifetimes and quantum yields are rather high in some cases.
在插入-偶联-异构化-Diels-Alder杂多米诺反应的意义上,炔丙基邻碘苯酚酯或炔丙基邻苯二甲酸酯和炔丙基烯丙基醚在Sonogashira偶联条件下反应,从而以良好的状态提供(四氢异苯并呋喃)-螺并苯并呋喃酮和-螺二氢吲哚并酮产量。可以使许多代表结晶,并且单晶结构分析显示出对末端(杂)芳基和中心顺式,反式-丁二烯片段的扭转角的空间和电子取代基作用。DFT计算表明,在最后的周环步骤中,与可能的克莱森重排相比,在热力学和动力学上都比对Diels-Alder终止。这类新型的螺环化合物具有较大的斯托克斯位移,并且发出强烈的荧光,并带有蓝色,而不是绿色到橙色。由于具有螺线刚性,在某些情况下,荧光寿命和量子产率都很高。