- Oxidative electrochemical aryl C-C coupling of spiropyrans
-
The isolation and definitive assignment of the species formed upon electrochemical oxidation of nitro-spiropyran (SP) is reported. The oxidative aryl C-C coupling at the indoline moiety of the SP radical cation to form covalent dimers of the ring-closed SP form is demonstrated. The coupling is blocked with a methyl substituent para to the indoline nitrogen.
- Ivashenko, Oleksii,Van Herpt, Jochem T.,Rudolf, Petra,Feringa, Ben L.,Browne, Wesley R.
-
-
Read Online
- Design, synthesis and biological evaluation of novel heptamethine cyanine dye-erlotinib conjugates as antitumor agents
-
Epidermal growth factor receptor tyrosine kinase (EGFR-TK) has been proved as a target for the treatment of non-small cell lung cancer (NSCLC) with specific gene mutations. However, EGFR-TK inhibitors (EGFR-TKIs) need to enter cancer cells and then competitively interact with the active site of tyrosine kinase receptors to suppress the downstream signaling pathway 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 heptamethine cyanine dyes to form seventeen novel erlotinib-dye conjugates. The efficiency of tumor targeting properties of conjugates against cancer cell growth and EGFR-TK inhibition was evaluated in vitro. The result revealed that most erlotinib-dye conjugates exhibited stronger inhibitory effect on A549, H460, H1299 and MDA-MB-231 cell lines than the parent drug erlotinib. Meanwhile, representative compounds exhibited weak cytotoxicity on human normal mammary epithelial MCF-10A cells. Moreover, the conjugate CE17 also showed ~14-fold higher EGFR-TK inhibition activity (IC50 = 0.124 μM) than erlotinib (IC50 = 5.182 μM) in A549 cell line. Finally, molecular docking analysis verified that the erlotinib moiety of compound CE17 could form hydrogen bond with Met-769 and occupy active cavity of EGFR-TK. Therefore, we believed the integration strategy between heptamethine cyanine dyes and EGFR-TKI will contribute to enhancing the therapeutic effect of EGFR-TKI for NSCLC treatment.
- Guo, Chun,Hou, Zhuang,Mou, Yanhua,Wang, Dun,Yang, Xiaoguang
-
supporting information
(2020/10/02)
-
- Iodine-Promoted Domino Oxidative Cyclization for the One-Pot Synthesis of Novel Fused Four-Ring Quinoxaline Fluorophores by sp3 C?H Functionalization
-
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)-5,12-dihydroquinolino[2,3-b]quinoxaline showed good photophysical properties and was used in live cell imaging, indicating the potential value of this skeleton as a fluorophore in probes.
- Zhang, Yong,Yang, Min,Jia, Chengli,Ji, Min
-
supporting information
p. 13709 - 13713
(2019/11/05)
-
- 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.
- Fei, Xuening,Hao, Yachao,Gu, Yingchun,Li, Chao,Yu, Lu
-
p. 563 - 568
(2014/05/06)
-
- Oxidative palladium(II)-catalyzed dehydrogenative C-H/C-H cross-coupling of 2,3-substituted indolines with arenes at the C7 position
-
Directed directing group: The C7 position of the indoline nucleus is difficult to address in C-H activation. An oxidative palladium(II) catalysis that allows for cross-dehydrogenative coupling in that position with activation of the C-H bond of the arene component is disclosed here. This C-H/C-H cross-coupling is applicable to various indolines acetylated at the nitrogen atom. Substitution at C2 is crucial for the C-H activation to occur at C7 (see scheme).
- Jiao, Lin-Yu,Oestreich, Martin
-
supporting information
p. 10845 - 10848
(2013/09/02)
-
- INDICYANINE DYES AND THE DERIVATIVES THEREOF FOR ANALYSING BIOLOGICAL MICROMOLECULES
-
The invention relates to two series of synthesised indolenine pentamethine dyes (37 compounds) comprising a reactive group in the third and fifth positions of the indolenine cycle, respectively. A method for producing, extracting and purifying the dyes and the precursors thereof, consisting in determining the absorption and fluorescence maxima, molecular extinction factors, fluorescence quantum yields, relative fluorescence effectiveness at excitation on a wavelength of 635 nm (detection of 670 nm) and 655 nm (detection of 690 nm), relative light stability and comparative sensitivity of detection of marked oligonucleotides on biochips of the claimed dyes, is disclosed. The use of the claimed dyes in the form of fluorescent marks for oligonucleotide and protein chips is also disclosed.
- -
-
Page/Page column 43
(2010/04/23)
-
- New 3H-indole synthesis by fischer's method. Part I.
-
Methyl indolenines (4a-c) and (5a-c) were prepared in high yield by a Fischer indole synthesis reaction of o,m-tolylhydrazine hydrochlorides (1a-b) with isopropyl methyl ketone (2) and 2-methylcyclohexanone (3) in acetic acid at room temperature. o,pNitrophenylhydrazines (1c-d) were reacted with 2-methylcyclohexanone (3) in acetic acid at reflux to give nitroindolenines (5d-e), while the attempted reactions of o,pnitrohydrazines with isopropyl methyl ketone (2) in acetic acid were not successful. Compounds (1c-d) were reacted with isopropyl methyl ketone (2) in acetic acid/HCl to give 2,3,3-trimethyl-5-nitro-indolenine (4e) and 2,3,3-trimethyl-7-nitroindolenine (4d). Copyright
- Sajjadifar, Sami,Vahedi, Hooshang,Massoudi, Abdolhossien,Louie, Omid
-
experimental part
p. 2491 - 2498
(2010/07/10)
-
- Synthesis and structure of indoline spiropyrans of the coumarin series
-
New indoline spiropyrans of the coumarin series were synthesized by the condensation of indoline and hydroxyformylcoumarin derivatives. Spiropyrans, viz., derivatives of 8-formyl-7-hydroxy-4-methylcoumarin and 5-formyl-6-hydroxy-4-methylcoumarin, under irradiation are transformed into open forms, which are recyclized in the dark. The compounds formed by the condensation of the indoline derivatives with 3-formyl-4-hydroxycoumarin have an open structure of the merocyanine dyes and are transformed into spiro forms neither in the dark nor under irradiation with the visible light.
- Traven,Miroshnikov,Chibisova,Barachevsky,Venidiktova,Strokach
-
p. 2417 - 2424
(2007/10/03)
-
- Ring transformations of heterocyclic compounds. XXII [1]. Pyrido[1,2-a]indolium salts from 2-methyl-3H-indoles by pyrylium mediated three carbon annelation
-
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] pyrylium ring transformation is reported. Spectroscopic data of the transformation products and their mode of formation are discussed.
- Zimmermann, Thomas,Hennig, Lothar
-
p. 263 - 269
(2007/10/03)
-
- PHOTOCHROMISM. SYNTHESIS AND PROPERTIES OF INDOLINOSPIROBENZOTHIOPYRANS
-
Novel photochromic compounds, indolinospirobenzothiopyrans, were prepared and their properties in polymer films were examined.The absorption bands of the colored form lie around 100 nm deeper in the long-wave region of the spectrum than are the case with the common spiropyrans.
- Arakawa, Sei'ichi,Kondo, Hirofumi,Seto, Jun'etsu
-
p. 1805 - 1808
(2007/10/02)
-
