1195-31-9Relevant academic research and scientific papers
Identification of an Asexual Reproduction Inducer of Phytopathogenic and Toxigenic Fusarium
Qi, Jianhua,Cheng, Lihong,Sun, Yujuan,Hirata, Yushi,Ushida, Naoki,Ma, Zhonghua,Osada, Hiroyuki,Nishikawa, Toshio,Xiang, Lan
, p. 8100 - 8104 (2018)
Asexual and sexual reproduction are the most important biological events in the life cycle of phytopathogenic and toxigenic Fusarium and are responsible for disease epidemics. However, the signaling molecules which induce the asexual reproduction of Fusarium are unknown. Herein we describe the structure elucidation, including the absolute configuration, of Fusarium asexual reproduction inducer (FARI), a new sesquiterpene derivative, by spectroscopic analysis, total synthesis, and conidium-inducing assays of synthetic isomers. We have also uncovered the universality of FARI among Fusarium species. Moreover, a mechanism-of-action study suggested that the Gpmk1 and LaeA signaling pathways are required for conidium formation induced by FARI; conversely, the Mgv1 of mitogen-activated protein kinase is not involved in conidium formation. FARI exhibited conidium-inducing activity at an extremely low dose and high stereoselectivity, which may suggest the presence of a stereospecific target.
Convenient one-pot synthesis of 4,8-dimethyl-bicyclo[3.3.1)non-7-en-2-ol via platinum/tin catalyzed hydroformylation/cyclization of limonene
Dias, Adelson de O.,Augusti, Rodinei,Dos Santos, Eduardo N.,Gusevskaya, Elena V.
, p. 41 - 44 (1997)
Limonene (1) was converted in one step into two diastereoisomers of 4,8-dimethyl-bicyclo[3.3.1]non-7-en-2-ol (2), useful as perfumes, employing PtCl2(PPh3)2/PPh3/SnCl2 and PtCl2(diphosphine)/PPh3/SnCl2 systems as bifunctional catalysts whose diphosphines were 1,3-bis(diphenylphosphino)propane (dppp) and 1,4-bis(diphenylphosphino)butane (dppb). In the presence of the PtCl2(dppb)/PPh3/SnCl2 system, which was found to be the most promising combination, the selectivity for 2 reached the value of 82% at 95% conversion of 1.
Pt- and Pd-catalysed limonene hydrogenation in high-density carbon dioxide
Bogel-Lukasik, Ewa,Bogel-Lukasik, Rafal,Da Ponte, Manuel Nunes
, p. 1361 - 1369 (2009)
This paper discusses the development of catalytic (Pt, Pd) hydrogenation in high-pressure CO2 to convert limonene into valuable chemicals. It was noticed that varying the catalyst results in product regioselectivity. Platinum as catalyst favours the formation of p-menthane stereoisomers in equimolar quantities whereas palladium as catalyst furnishes trans-p-menthane and cis-p-menthane in 2:1 ratio. These results are in agreement with hydrogenation mechanisms for Pt- and Pd-catalysed reactions. Platinum is a more active catalyst than palladium, but higher activity results in lower chemical stability of the catalyst. Palladium as catalyst usually catalyses limonene isomerisation in the first stage of the process. Pressure tuning of the processes affects termination of the reaction. The flow rate of the reaction mixture through the stationary catalyst bed affects the composition of products; partially hydrogenated limonene is obtained at low flow rates and completely hydrogenated products at high flow rates.
Synthesis of puleganic amides via a catalytically efficient two-step approach
Pérez, Ignacio,ávila-Zárraga, José Gustavo
, p. 3077 - 3079 (2018)
Puleganic amides display interesting insect-repellent properties. A new synthetic route to this type of amide was developed involving an organocatalytic cyclization and metal-catalyzed hydrogenation in a one-pot protocol. An eco-friendly oxidative amination provided the puleganic amides with only one purification step and acceptable yields.
Photo-Initiated Cobalt-Catalyzed Radical Olefin Hydrogenation
Sang, Sier,Unruh, Tobias,Demeshko, Serhiy,Domenianni, Luis I.,van Leest, Nicolaas P.,Marquetand, Philipp,Schneck, Felix,Würtele, Christian,de Zwart, Felix J.,de Bruin, Bas,González, Leticia,V?hringer, Peter,Schneider, Sven
, p. 16978 - 16989 (2021/08/09)
Outer-sphere radical hydrogenation of olefins proceeds via stepwise hydrogen atom transfer (HAT) from transition metal hydride species to the substrate. Typical catalysts exhibit M?H bonds that are either too weak to efficiently activate H2 or too strong to reduce unactivated olefins. This contribution evaluates an alternative approach, that starts from a square-planar cobalt(II) hydride complex. Photoactivation results in Co?H bond homolysis. The three-coordinate cobalt(I) photoproduct binds H2 to give a dihydrogen complex, which is a strong hydrogen atom donor, enabling the stepwise hydrogenation of both styrenes and unactivated aliphatic olefins with H2 via HAT.
Ambient Hydrogenation and Deuteration of Alkenes Using a Nanostructured Ni-Core–Shell Catalyst
Beller, Matthias,Feng, Lu,Gao, Jie,Jackstell, Ralf,Jagadeesh, Rajenahally V.,Liu, Yuefeng,Ma, Rui
supporting information, p. 18591 - 18598 (2021/06/28)
A general protocol for the selective hydrogenation and deuteration of a variety of alkenes is presented. Key to success for these reactions is the use of a specific nickel-graphitic shell-based core–shell-structured catalyst, which is conveniently prepared by impregnation and subsequent calcination of nickel nitrate on carbon at 450 °C under argon. Applying this nanostructured catalyst, both terminal and internal alkenes, which are of industrial and commercial importance, were selectively hydrogenated and deuterated at ambient conditions (room temperature, using 1 bar hydrogen or 1 bar deuterium), giving access to the corresponding alkanes and deuterium-labeled alkanes in good to excellent yields. The synthetic utility and practicability of this Ni-based hydrogenation protocol is demonstrated by gram-scale reactions as well as efficient catalyst recycling experiments.
Nickel-catalyzed reductive 1,3-diene formation from the cross-coupling of vinyl bromides
Sha, Yunfei,Liu, Jiandong,Wang, Liang,Liang, Demin,Wu, Da,Gong, Hegui
supporting information, p. 4887 - 4890 (2021/06/16)
Facile construction of 1,3-dienes building upon cross-electrophile coupling of two open-chain vinyl halides is disclosed in this work, showing moderate chemoselectivities between the terminal bromoalkenes and internal vinyl bromides. The present method is mild and tolerates a range of functional groups and can be applied to the total synthesis of a tobacco fragrance solanone.
Cobalt-Catalyzed Desymmetric Isomerization of Exocyclic Olefins
Lan, Yu,Liu, Qiang,Liu, Shihan,Liu, Xufang,Rong, Xianle
supporting information, p. 20633 - 20639 (2021/12/17)
Chiral cyclic olefins, 1-methylcyclohexenes, are versatile building blocks for the synthesis of pharmaceuticals and natural products. Despite the prevalence of these structural motifs, the development of efficient synthetic methods remains an unmet challenge. Herein we report a novel desymmetric isomerization of exocyclic olefins using a series of newly designed chiral cobalt catalysts, which enables a straightforward construction of chiral 1-methylcyclohexenes with diversified functionalities. The synthetic utility of this methodology is highlighted by a concise and enantioselective synthesis of a natural product, β-bisabolene. The versatility of the reaction products is further demonstrated by multifarious derivatizations.
Tetraalkylammonium Functionalized Hydrochars as Efficient Supports for Palladium Nanocatalysts
Duarte, Tiago A. G.,Favier, Isabelle,Pradel, Christian,Martins, Luísa M. D. R. S.,Carvalho, Ana P.,Pla, Daniel,Gómez, Montserrat
, p. 2295 - 2303 (2020/03/23)
With the aim of preparing bio-sourced supports with enhanced properties in catalysis, we devised an original strategy allowing the immobilization of metal nanoparticles. Thus, size-controlled hydrochars with a high degree of hydroxyl functionalities, from both neat sucrose or modified with acrylic acid (10 wt.%), were derivatized with ether linkers containing ammonium groups. These non-porous carbon-based materials were used as suitable supports for the immobilization of palladium nanoparticles. The catalytic materials were synthesized by reduction of Pd(OAc)2 to Pd(0) under H2 atmosphere in the presence of the corresponding hydrochar, and fully characterized by standard methods. Among the different hydrochar-supported palladium materials, those functionalized with tetraalkylammonium groups afforded heterogeneous catalysts, exhibiting high activity in hydrogenations of different types of substrates (alkynes, alkenes, and carbonyl and nitro derivatives). The most efficient catalyst was recycled up to ten runs without loss of catalytic behavior, in agreement with the unchanged composite materials after catalysis (Transmission Electron Microscopy (TEM) analyses) and the lack of metal leaching in the extracted organic products (no palladium detected by Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES)); these systems exhibited enhanced recyclability properties as compared to commercial Pd/C catalyst.
Biomolecule-derived supported cobalt nanoparticles for hydrogenation of industrial olefins, natural oils and more in water
Pews-Davtyan, Anahit,Scharnagl, Florian Korbinian,Hertrich, Maximilian Franz,Kreyenschulte, Carsten,Bartling, Stephan,Lund, Henrik,Jackstell, Ralf,Beller, Matthias
supporting information, p. 5104 - 5112 (2019/09/30)
Catalytic hydrogenation of olefins using noble metal catalysts or pyrophoric RANEY nickel is of high importance in the chemical industry. From the point of view of green and sustainable chemistry, design and development of Earth-abundant, less toxic, and more environmentally friendly catalysts are highly desirable. Herein, we report the convenient preparation of active cobalt catalysts and their application in hydrogenations of a wide range of terminal and internal carbon-carbon double bonds in water under mild conditions. Catalysts are prepared on multi-gram scale by pyrolysis of cobalt acetate and uracil, guanine, adenine or l-tryptophan. The most active material Co-Ura/C-600 showed good productivity in industrially relevant hydrogenation of diisobutene to isooctane and in natural oil hardening.
