Biotransformation of the phytoalexin camalexin by the phytopathogen Rhizoctonia solani
摘要:
The unusual metabolism of the cruciferous phytoalexin camalexin by virulent and weakly virulent isolates of the root rot fungus Rhizoctonia solani Kuhn is reported. This biotransformation proceeded via 5-hydroxycamalexin, which was further biotransformed into more polar metabolites. Importantly, the metabolites resulting from transformation of camalexin were significantly less toxic to the pathogen than camalexin. Thus, it was concluded that R. solani can detoxify camalexin through oxidation of the indole ring. The chemistry involved in the structure determination of the intermediates of this pathway, their synthesis as well as antifungal activity is described. (C) 2000 Elsevier Science Ltd. All rights reserved.
Synthesis and peripheral substituent effects of bay-annulated indigo derivatives
作者:Taniyuki Furuyama、Daichi Tamura、Hajime Maeda、Masahito Segi
DOI:10.1016/j.tetlet.2018.06.036
日期:2018.7
study, indolo-naphthyridine-6,13-diones (5a–d) with four different peripheral substituents were prepared via bay-annulation reactions of indigo. The resulting compounds (5a–d) exhibited fluorescence in the red to near-IR region, while the parent indigo molecule showed no fluorescence. Although the peripheral substituents were oriented to the exterior of the π-conjugated system, the electronic structure
The organic semiconductor polymers relate to polymers containing an indolo-naphthyridine-6,13-dione thiophene (INDT) chromophore. The organic semiconductor polymers are formed by polymerizing INDT monomer with thiophene to obtain a conjugated polymer of the chromophore linked by thiophene monomers (INDT-T), with phenyl to obtain a conjugated polymer of the chromophore linked by phenyl monomers (INDT-P), with selenophene to obtain a conjugated polymer of the chromophore linked by selenophene monomers (INDT-S), or with benzothiadazole to obtain a conjugated polymer of the chromophore linked by benzothiadazole monomers (INDT-BT).
The organic semiconductor polymers relate to polymers containing an indolo-naphthyridine-6,13-dione thiophene (INDT) chromophore. The organic semiconductor polymers are formed by polymerizing INDT monomer with thiophene to obtain a conjugated polymer of the chromophore linked by thiophene monomers (INDT-T), with phenyl to obtain a conjugated polymer of the chromophore linked by phenyl monomers (INDT-P), with selenophene to obtain a conjugated polymer of the chromophore linked by selenophene monomers (INDT-S), or with benzothiadazole to obtain a conjugated polymer of the chromophore linked by benzothiadazole monomers (INDT-BT).
A Nature-Inspired Conjugated Polymer for High Performance Transistors and Solar Cells
作者:Kealan J. Fallon、Nilushi Wijeyasinghe、Nir Yaacobi-Gross、Raja S. Ashraf、David M. E. Freeman、Robert G. Palgrave、Mohammed Al-Hashimi、Tobin J. Marks、Iain McCulloch、Thomas D. Anthopoulos、Hugo Bronstein
DOI:10.1021/acs.macromol.5b00542
日期:2015.8.11
A novel, highly soluble chromophore for use in organic electronics based on an indigoid structure is reported. Copolymerization with thiophene affords an extremely narrow band gap polymer with a maximum absorption at similar to 800 nm. The novel polymer exhibits high crystallinity and high ambipolar transport in OFET devices of 0.23 cm(2) V-1 s(-1) for holes and 0.48 cm(2) V-1 s(-1) for electrons. OPV device efficiencies up to 2.35% with light absorbance up to 950 nm demonstrate the potential for this novel chromophore in near-IR photovoltaics.