Synthesis of 6H-Indolo[2,3-b][1,6]naphthyridines and Related Compounds as the 5-Aza Analogues of Ellipticine Alkaloids
摘要:
Treatment of 2-(1-alkynyl)phenyl isocyanates 6 with the iminophosphorane 14 produced in situ the benzoenynyl carbodiimides 15. Thermolysis of 15 under refluxing p-xylene furnished the 6H-indolo[2,3-b][1,6]naphthyridines 5, which could be regarded as the 5-aza analogues of ellipticine alkaloids. Similarly,condensation of 6 with the iminophosphorane 20 led to the formation of the 6H-indolo[2,3-b][1,5]naphthyridines 25 as the major isomer and the 10H- indolo[2,3-b][1,7]-naphthyridines 26 as the minor isomer. The indolonaphthyridines 32, 33, and 34 having a methoxyl substituent were likewise synthesized. Treatment of the diisocyanate 43 with 2 equiv of the iminophosphorane 7 furnished 45 having two indoloquinoline units incorporated in a seven-fused-ring system.
Synthesis of 6<i>H</i>-Indolo[2,3-<i>b</i>][1,6]naphthyridines and Related Compounds as the 5-Aza Analogues of Ellipticine Alkaloids
作者:Quan Zhang、Chongsheng Shi、Hai-Ren Zhang、Kung K. Wang
DOI:10.1021/jo000978e
日期:2000.11.1
Treatment of 2-(1-alkynyl)phenyl isocyanates 6 with the iminophosphorane 14 produced in situ the benzoenynyl carbodiimides 15. Thermolysis of 15 under refluxing p-xylene furnished the 6H-indolo[2,3-b][1,6]naphthyridines 5, which could be regarded as the 5-aza analogues of ellipticine alkaloids. Similarly,condensation of 6 with the iminophosphorane 20 led to the formation of the 6H-indolo[2,3-b][1,5]naphthyridines 25 as the major isomer and the 10H- indolo[2,3-b][1,7]-naphthyridines 26 as the minor isomer. The indolonaphthyridines 32, 33, and 34 having a methoxyl substituent were likewise synthesized. Treatment of the diisocyanate 43 with 2 equiv of the iminophosphorane 7 furnished 45 having two indoloquinoline units incorporated in a seven-fused-ring system.
Photochromic, organogelating and self-sorting behaviour of di-(dithienylethene) derivatives
作者:Kun Zheng、Huaizhen Wang、Hak-Fun Chow
DOI:10.1039/c9ob00220k
日期:——
characterized. Their organogelation property could be rationally optimized by controlling the extent of intramolecular vs. intermolecular hydrogen bonding and also by tuning the extent of side chain interdigitation. Among these compounds, diDTE-Dec-NHDodec4e showed excellent gelation properties with minimum gelation concentration (MGC) values ≤10 mg mL−1 in a wide variety of aromatic solvents. Upon UV (313 nm)
合成并表征了一系列二(二噻吩基乙烯)(DTE)四酰胺4 diDTE-X-NHR。通过控制分子内与分子间的程度可以合理地优化它们的有机凝胶性质。分子间氢键键合,也可以通过调节侧链相互交叉的程度来实现。在这些化合物中,diDTE-Dec-NHDodec 4e在多种芳香族溶剂中显示出优异的胶凝特性,最小胶凝浓度(MGC)值≤10mg mL -1。在紫外线(313 nm)照射下,4e中32%的DTE功能进行了光环化,伴随着光致变色变化和凝胶网络结构的显着减弱。纯双环异构体分离出4e- cc,发现在有限数量的芳香族溶剂中,它是一种非常弱的有机胶凝剂(MGC〜25 mg mL -1)。更有趣的是,在4e和4e - cc冻干凝胶样品的1:1混合物中观察到4e和4e- cc的自分选,表明这两种凝胶的混合凝胶中存在高度的非自我区分结构类似的异构体。结果表明,这种二-DTE衍生物是具有令人感兴趣的有机胶凝和自分选性质的光致变色材料。