Synthesis and photochromic properties of spiropyrans containing a fused benzopyranone fragment
摘要:
New spiro compounds of the indole, phthalazine, isobenzofuran, and benzopyran series, containing a fused benzopyranone fragment in the chromene moiety, were synthesized. Indole derivatives were found to exhibit photochromic properties under stationary conditions at 293 K. The thermal stability of merocyanine isomers sharply decreases upon introduction of electron-withdrawing nitro group into the indole fragment and fusion of a benzene ring to the chromene fragment.
3<i>H</i>-indolium salts efficiently prepared from<i>N</i>-substituted anilines and α-branched ketones by an one-pot synthesis
作者:Thomas Zimmermann、Ortwin Brede
DOI:10.1002/jhet.5570410117
日期:2004.1
and the α-branched ketones 3 the 3H-indolium salts 1 and their fused derivatives 13 are prepared by combining a sodium nitrite nitrosation, a zinc dust reduction, a hydrazoneformation and a Fischerindolization to a reaction sequence in which the isolation and purification of intermediates is not necessary. The scope and limitations of this effective one-potsynthesis are discussed.
Synthesis and photochromic properties of spiropyrans containing a fused benzopyranone fragment
作者:O. G. Nikolaeva、E. B. Gaeva、E. N. Shepelenko、A. V. Tsukanov、A. V. Metelitsa、B. S. Luk’yanov、A. D. Dubonosov、V. A. Bren’、V. I. Minkin
DOI:10.1134/s1070428009070173
日期:2009.7
New spiro compounds of the indole, phthalazine, isobenzofuran, and benzopyran series, containing a fused benzopyranone fragment in the chromene moiety, were synthesized. Indole derivatives were found to exhibit photochromic properties under stationary conditions at 293 K. The thermal stability of merocyanine isomers sharply decreases upon introduction of electron-withdrawing nitro group into the indole fragment and fusion of a benzene ring to the chromene fragment.