Ring transformations of heterocyclic compounds.<b>XXIII</b>. The UV irradiation product of photochromic 2,4,6-triaryl-1-(spiro[2<i>H</i>-l-benzopyran-2,2′-indoline]-6-yl)pyridinium salts - A phenolate betaine or a pyridinium substituted merocyanine dye?
作者:Thomas Zimmermann、Ortwin Brede
DOI:10.1002/jhet.5570400409
日期:2003.7
The synthesis of the novel 2,4,6-triaryl-1-(spiro[2H-1-benzopyran-2,2′-indoline]-6-yl)pyridiniumper-chlorates 4 by reaction of 5-nitrosalicylaldehydes 6 with 1,3,3-trimethyl-2-methyleneindoline (7) to 6-nitro-spiro[2H-1-benzopyran-2,2′-indolines] 1, their stannous chloride reduction to the 6-amino derivatives 8, followed by a 2,6-[C5+N] ring transformation with 2,4,6-triarylpyrylium perchlorates 9
5-硝基水杨醛6与1的反应合成新颖的2,4,6-三芳基-1-(螺[2 H -1-苯并吡喃-2,2'-二氢吲哚] -6-基)吡啶鎓高氯酸盐4,3,3-三甲基-2-亚甲基二氢吲哚(7)生成6-硝基-螺[2 H -1-苯并吡喃-2,2'-二氢吲哚] 1,氯化亚锡还原为6-氨基衍生物8,然后2,4,6-三芳基高氯酸鎓盐进行的2,6- [C 5 + N]环转化9,据报道。在20种极性不同的溶剂中进行的紫外线照射实验证明了它们的光致变色性质,并表明由光化学生成的负溶剂溶变色染料5是由苯并吡喃部分4的开环形成的,而不是比吡啶鎓苯酚甜菜碱甜菜碱染料更深的花菁。