作者:N. A. Voloshin、A. V. Chernyshev、S. O. Bezuglyi、A. V. Metelitsa、E. N. Voloshina、V. I. Minkin
DOI:10.1007/s11172-008-0022-y
日期:2008.1
The Duff formylation of 5-bromo- or 5-chloro-8-hydroxyquinoline leads to the corresponding 7-formyl derivatives, condensation of which with 2-methyleneindolines or 3H-indolium halides in the presence of a base afforded new photochromic 6′-halo-substituted spiro[indoline-2,2′-2H- pyrano[3,2-h]quinolines]. Thermal and photo-induced isomerization of compounds obtained have been investigated by 1H NMR