A procedure was developed for phase-transfer catalyzed alkylation of 5-hydroxyindolenineand 9'-hydroxy-substituted spiro[indoline-2,3'-naphtho[2,1-b]oxazines] by alkyl halides. New 9'-hydroxy- and 9'-alkoxy-substituted spironaphthooxazines, spirooxazinyloxyacetic acids, and their esters containing substituents with different length of the carbon chain in the indoline moiety were synthesized. The influence of the substituents on the spectroscopic properties of the starting and colored forms and the kinetic characteristics of photochromic transformations of 9'-substituted spironaphthooxazines in solutions and polymeric films was investigated. The bipolar merocyanine forms of spirooxazines were found to produce H-aggregates.
Metal-Free Sequential C(sp<sup>2</sup>)–H/OH and C(sp<sup>3</sup>)–H Aminations of Nitrosoarenes and <i>N</i>-Heterocycles to Ring-Fused Imidazoles
作者:Anisha Purkait、Subhra Kanti Roy、Hemant Kumar Srivastava、Chandan K. Jana
DOI:10.1021/acs.orglett.7b00832
日期:2017.5.19
Hydrogen bond assisted ortho-selective C(sp2)–Hamination of nitrosoarenes and subsequent α-C(sp3)-H functionalization of aliphatic amines is achieved under metal-free conditions. The annulation of nitrosoarenes and 2-hydroxy-C-nitroso compounds with N-heterocycles provides a facile excess to a wide range of biologically relevant ring-fused benzimidazoles and structurally novel polycyclic imidazoles
氢键辅助的亚硝基芳烃的邻位选择性C(sp 2)-H氨基化和随后的α-C(sp 3)-H脂肪族胺的官能化在无金属条件下实现。亚硝基芳烃和2-羟基-C-亚硝基化合物与N-杂环的环化分别提供了相对于广泛的生物学相关的环稠合的苯并咪唑和结构上新颖的多环咪唑的简便过量。发现在卤代亚硝基芳烃的C(sp 2)–H胺化过程中,亲核芳香族氢取代(S N ArH)比经典S N Ar反应更可取。
Crown-containing spirooxazines and spiropyrans
作者:O. A. Fedorova、S. P. Gromov、Yu. P. Strokach、Yu. V. Pershina、S. A. Sergeev、V. A. Barachevskii、G. Pepe、A. Samat、R. Guglielmetti、M. A. Alfimov
DOI:10.1007/bf02494754
日期:1999.10
Methods for the synthesis of new spironaphthooxazines containing an aza-15-crown-5 fragment in two different positions (5′ and 9′) were developed. The spectral and photochemical properties of these compounds suggest that two competitive complexation processes occur with alkaline-earth or rare-earth metal cations differing in efficiency and selectivity. A metal cation occupies the optimum position in
Preparation of a spirooxazine grafted PMMA and its photochromic properties
作者:Liang Wu、Sai Zhang、Jun Gao、Peirong Qiang、Jingxin Lei
DOI:10.1080/00397911.2016.1178296
日期:2016.5.2
characterized using 1H NMR and infrared. Beyond that, photochromicproperties were studied in detail. We discuss the effects of hydrochloric acids and hPMMAs of different hydrolysis degrees on photochromicproperties of SO-g-hPMMA. Additionally, mechanical properties of the material were studied. Results indicate that the colored ring-opening form (PMC) of SO-g-hPMMA exhibits a good performance in terms of thermal
摘要 设计并合成了一种新型的螺恶嗪(SO)化合物。使用不同水解度的 PMMA(聚甲基丙烯酸甲酯)制备称为 SO-g-hPMMA(其中 g 表示接枝,h 表示部分水解)的大分子材料。SO-g-5%hPMMA 通过含 SO 的活性 C-Br 键与 5% 部分水解的 PMMA 反应制备。SO 使用 1 H NMR 和红外进行表征。除此之外,还详细研究了光致变色特性。我们讨论了不同水解度的盐酸和 hPMMA 对 SO-g-hPMMA 光致变色性能的影响。此外,还研究了材料的机械性能。结果表明,与同源 SO 相比,SO-g-hPMMA 的有色开环形式 (PMC) 在热稳定性方面表现出良好的性能。实验还证明盐酸提高了 PMC 的热稳定性。与具有不同水解度的那些相比,SO-g-9%hPMMA 表现出良好的光致变色性能。图形概要