Ring transformations of heterocyclic compounds.<b>XXII</b>. Pyrido[1,2-<i>a</i>]indolium salts from 2-methyl-3<i>H</i>-indoles by pyrylium mediated three carbon annelation
作者:Thomas Zimmermann、Lothar Hennig
DOI:10.1002/jhet.5570390203
日期:2002.3
The synthesis of pyrido[1,2-a]indolium perchlorates 8,11 from 2,4,6-triarylpyrylium perchlorates 1 and 2-methyl-3H-indoles 6,9 in the presence of a basic condensing agent (anhydrous sodium acetate, piperidine acetate, triethylamine/acetic acid, triethylamine) in ethanol by a 2,4-[C3+C2N] pyryliumringtransformation is reported. Spectroscopic data of the transformation products and their mode of formation
吡啶并合成[1,2一]吲哚鎓高氯酸盐-8,11-从2,4,6-三芳基高氯酸盐1和2-甲基-3- ħ -indoles 6,9在碱性缩合剂的存在下(无水醋酸钠报道了乙醇中乙酸哌啶,三乙胺/乙酸,三乙胺通过2,4- [C 3 + C 2 N]吡啶鎓环的转化。讨论了转化产物的光谱数据及其形成方式。
Study on the Synthesis and Spectra of a Novel Kind of Carbozole Benzothiazole Indole Styryl Cyanine Dye with a Carbazole Bridged Chain
Based on the frequently-used cyanine dye probe thiazole orange (TO) and Cy3, a novel kind of styryl cyanine dye was designed and synthesized. Carbazole was inserted into the structures of two cyanine dyes, TO and Cy3, to act as a bridge to link the benzothiazole and indole. This modification resulted in a novel kind of carbozole benzothiazole indole cyanine dye with a carbazole-bridged chain. The dyes were characterized by HNMR and MS. The spectra of the novel dyes were also studied and the results showed that the fluorescence wavelength of novel carbazole benzothiazole indole cyanine dye shifted red, the Stokes shift and Fluorescence quantum yields increased and the fluorescence intensity was enhanced compared to that of TO. These results indicated that the novel dye could be used as an excellent fluorescent probe in biological labeling.
Iodine‐Promoted Domino Oxidative Cyclization for the One‐Pot Synthesis of Novel Fused Four‐Ring Quinoxaline Fluorophores by sp
<sup>3</sup>
C−H Functionalization
作者:Yong Zhang、Min Yang、Chengli Jia、Min Ji
DOI:10.1002/chem.201903688
日期:2019.10.28
A method for the synthesis of novel fused four-ring quinoxaline skeleton has been described by an I2 promoted sp3 C-H functionalization between 1,2,3,3-tetramethyl-3H-indolium iodides and 1,2-diamines. This transformation proceeds smoothly under metal- and peroxide-free conditions through a sequential iodination, oxidation, annulation and rearrangement. Moreover, 8,9-dichloro-5,12,12-trimethyl-2-(trifluoromethyl)-5
competitively interact with the active site of tyrosine kinase receptors to suppress the downstream signalingpathway to inhibit tumor proliferation. In this study, in order to improve the tumor cell targeting ability of EGFR-TKI, EGFR-TKI erlotinib was conjugated with the cancer cell-targeting heptamethinecyaninedyes to form seventeen novel erlotinib-dye conjugates. The efficiency of tumor targeting properties
Dyes and photoluminescent compounds based on polymethine dyes that contain at least one alkyl-phosphonate or substituted alkyl-phosphonate group, including the synthetic precursors, methods of synthesis, and applications thereof. Certain embodiments include heterocyclic ring systems and polymethine linkage are selected such that the resulting polymethine dye is a cyanine dye, a merocyanine dye, or a styryl dye.