Unexpected formation of new photochromic compounds derived from 3,3-diphenyl-3H-naphtho[2,1-b]pyran-1-one
作者:Céu M. Sousa、Paulo J. Coelho、Luis M. Carvalho、Gaston Vermeersch、Jérôme Berthet、Stephanie Delbaere
DOI:10.1016/j.tet.2010.07.044
日期:2010.10
this ketone with the silyl enol ether methyl trimethylsilyl dimethylketene acetal, catalyzed by TiCl4, afforded the photochromic dihydronaphtho[2,1-b]pyranone 2. The Reformatsky reaction of ketone 1 with ethyl bromoacetate led to the formation of the expected alcohol that under acid treatment gave, unexpectedly, the novel photochromic benzocoumarin 6. UV irradiation compounds 2 and 6 in solution provided
从萘并[2,1 - b ]吡喃-1-酮1中获得了两种新的出乎意料的光致变色化合物。该酮与TiCl 4催化的甲硅烷基烯醇醚甲基三甲基甲硅烷基二甲基乙烯酮缩醛反应,得到光致变色二氢萘并[ 2,1- b ]吡喃酮2。酮1与溴乙酸乙酯的Reformatsky反应导致形成预期的醇,该醇在酸处理下意外地产生了新型的光致变色苯并香豆素6。紫外线照射化合物2和6溶液中提供的热稳定光产品在可见光照射下又恢复为最初的无色形式。这些化合物的光致变色行为和在这些反应中形成的光产物的结构通过1D和2D NMR表征。