120743-99-9Relevant academic research and scientific papers
Dearomatizing spirocyclization of thioureas, ureas and guanidines
Aziz, Marian N.,Singh, Ravi P.,Gout, Delphine,Lovely, Carl J.
, (2021)
An investigation of the dearomatization reactions of benzylic thioureas, ureas and guanidines using hypervalent iodine reagents is described. Initial attempts to perform this reaction with methyl aryl ethers was compromised by electrophilic addition leadi
Bioluminescent coelenterazine derivatives with imidazopyrazinone C-6 extended substitution
Nishihara, Ryo,Suzuki, Hideyuki,Hoshino, Emi,Suganuma, Sakura,Sato, Moritoshi,Saitoh, Tsuyoshi,Nishiyama, Shigeru,Iwasawa, Naoko,Citterio, Daniel,Suzuki, Koji
, p. 391 - 394 (2015)
Three novel coelenterazine (CTZ) derivatives with extension at the C-6 position of the imidazopyrazinone structure show significant bioluminescence emission with known renilla luciferase variants, indicating a promising method to develop CTZ derivatives w
Catalytic synthesis of aldehydes and ketones under mild conditions using tempo/oxone
Bolm, Carsten,Magnus, Angelika S.,Hildebrand, Jens P.
, p. 1173 - 1175 (2000)
A novel, metal-free oxidation system for the catalytic synthesis of aldehydes and ketones - TEMPO/Oxone - has been developed. An optimized reaction protocol proved especially successful for the synthesis of ketones. Additionally, the influence of quarternary ammonium salts on the catalysis was studied. The mild conditions of this novel procedure were shown to tolerate even sensitive silyl protective groups which can otherwise be cleaved in the presence of Oxone.
A General Strategy for Through-Bond Energy Transfer Fluorescence Probes Combining Intramolecular Charge Transfer: A Silyl Ether System for Endogenous Peroxynitrite Sensing
Lu, Gonghao,Guo, Yuxin,Zhuo, Jiezhen,Li, Xue,Chi, Haijun,Zhang, Zhiqiang
, p. 16350 - 16357 (2019)
A general strategy is reported for developing through-bond energy transfer (TBET) fluorescence probes by combining intramolecular charge transfer (ICT). The strategy uses a coplanar donor-π-bridge-acceptor system (SiOPh-PyOH) without spirolactam. The off-on switch of TBET and ICT is controlled by coplanar structure changes in the sensing process instead of spirolactam ring-opening in traditional TBET probes. DFT calculations showed that the energy and charge transfers from SiOPh to PyOH are prohibited. Since the SiOPh has no fluorescence, the probe SiOPh-PyOH shows fluorescence properties similar to that of pyrene. After sensing ONOO?, the silyl ether is removed and the probe changes into ?OPh-PyO?. Electron-donating ICT from OPh to PyO? induces a large redshift of emission to 594 nm (179 nm shift). TBET from OPh to PyO? ensures the probe exhibits a large pseudo-Stokes shift of 213 nm. Furthermore, the probe was successfully used in endogenous ONOO? detection. This study offers a new strategy for the construction of TBET probes emitting in the red region without spirolactam ring-opening, a new ONOO? sensing system using silyl ether as a reaction site, and a method for the deprotection of silyl ethers with ONOOH under mild conditions.
Synthesis of amphiphilic diblock copolymers of isotactic polystyrene-block-isotactic poly(p-hydroxystyrene) using a titanium complex with an [OSSO]-type bis(phenolate) ligand and sequential monomer addition
Zhou, QiHua,Liang, HuaQing,Wei, WanChu,Meng, ChunFeng,Long, YongJiang,Zhu, FangMing
, p. 19885 - 19893 (2017)
A series of isotactic diblock copolymers of polystyrene-block-poly(p-tert-butyldimethylsilyloxystyrene) (iPS-b-iP(p-TBDMSOS)) were successfully synthesized using living coordination polymerization techniques with a kind of titanium dichloro complex contai
Bismuth compounds in organic synthesis. Bismuth nitrate catalyzed chemoselective synthesis of acylals from aromatic aldehydes
Aggen, David H.,Arnold, Joshua N.,Hayes, Patrick D.,Smoter, Nathaniel J.,Mohan, Ram S.
, p. 3675 - 3679 (2004)
Aromatic aldehydes are smoothly converted into the corresponding acylals in good yields in the presence of 3-10mol% Bi(NO3) 3·5H2O. Ketones are not affected under the reaction conditions. The relatively non-toxic nature of the catalyst, its ease of handling, easy availability and low cost make this procedure especially attractive for large-scale synthesis.
Metallocene-mediated synthesis of chain-end functionalized polypropylene and application in PP/clay nanocomposites
Chung
, p. 6292 - 6299 (2005)
This paper summarizes our research in the preparation of chain end functionalized isotactic polypropylene (PP) having a terminal functional group, such as Cl, OH, and NH2. The chemistry involves metallocene-mediated propylene polymerization usi
Microwave-assisted protection of phenols as tert-butyldimethylsilyl (TBDMS) ethers under solvent-free conditions
Bastos, Erick L.,Ciscato, Luiz F. M. L.,Baader, Wilhelm J.
, p. 1501 - 1509 (2005)
A facile, time-saving procedure to protect phenols with tert-butyldimethylsilyl chloride using imidazole as catalyst under solvent-free conditions is described. Several phenolic compounds with different substitution patterns can be silylated in high yield
Cyclic Diaryl λ3-Bromanes: A Rapid Access to Molecular Complexity via Cycloaddition Reactions
Lanzi, Matteo,Ali Abdine, Racha Abed,De Abreu, Maxime,Wencel-Delord, Joanna
supporting information, p. 9047 - 9052 (2021/12/06)
Biaryls have widespread applications in organic synthesis. However, sequentially polysubstituted biaryls are underdeveloped due to their challenging preparation. Herein, we report the synthesis of dissymetric 2,3,2′,3′,4-substituted biaryls via pericyclic reactions of cyclic diaryl λ3-bromanes. The functional groups tolerance and atom economy allow access to molecular complexity in a single reaction step. Continuous flow protocol has been designed for the scale-up of the reaction, while postfunctionalizations have been developed taking advantage of the residual Br-atom.
Polysulfonate supported chiral diamine-nickel catalysts: Synthesis and applications
Zhou, Jing-xuan,Zhu, Dong-yu,Chen, Jie,Zhang, Xue-jing,Yan, Ming,Chan, Albert S.C.
supporting information, (2021/01/25)
A series of chiral polysulfonate cyclohexyldiamine-Ni(II) catalysts were prepared via sulfur (VI) fluoride exchange click-reactions. The catalysts exhibited good catalytic activity and enantioselectivity in the Michael addition of malonates to nitroalkene
