3183-21-9Relevant academic research and scientific papers
Highly active bidentate N-heterocyclic carbene/ruthenium complexes performing dehydrogenative coupling of alcohols and hydroxides in open air
Wang, Zhi-Qin,Tang, Xiao-Sheng,Yang, Zhao-Qi,Yu, Bao-Yi,Wang, Hua-Jing,Sang, Wei,Yuan, Ye,Chen, Cheng,Verpoort, Francis
supporting information, p. 8591 - 8594 (2019/07/25)
Eight bidentate NHC/Ru complexes, namely [Ru]-1-[Ru]-8, were designed and prepared. In particular, [Ru]-2 displayed extraordinary performance even in open air for the dehydrogenative coupling of alcohols and hydroxides. Notably, an unprecedentedly low catalyst loading of 250 ppm and the highest TON of 32 800 and TOF of 3200 until now were obtained.
General Synthesis of Amino Acid Salts from Amino Alcohols and Basic Water Liberating H2
Hu, Peng,Ben-David, Yehoshoa,Milstein, David
supporting information, p. 6143 - 6146 (2016/06/09)
An atom-economical and environmentally friendly method to transform amino alcohols to amino acid salts using just basic water, without the need of pre-protection or added oxidant, catalyzed by a ruthenium pincer complex, is developed. Water is the solvent, the source of the oxygen atom of the carboxylic acid group, and the actual oxidant, with liberation of dihydrogen. Many important and useful natural and unnatural amino acid salts can be produced in excellent yields by applying this new method.
Thermoresponsive poly(N -C3 glycine)s
Robinson, Joshua W.,Secker, Christian,Weidner, Steffen,Schlaad, Helmut
, p. 580 - 587 (2013/05/08)
Ring-opening polymerization of N-substituted glycine N-carboxyanhydrides (NCAs) was applied to prepare a series of well-defined poly(N-C3 glycine)s (C3 = n-propyl, allyl, propargyl, and isopropyl), polypeptoids, with molecular weights in the range of 1.8-6.6 kg mol-1. Poly(N-isopropyl glycine), a previously unreported polypeptoid, could be obtained by bulk polymerization of the corresponding NCA in the melt. The samples were characterized by spectroscopy (NMR and FT-IR), size exclusion chromatography (SEC), and matrix-assisted laser desorption/ionization time-of-flight mass spectroscopy (MALDI-ToF MS). The polymers could be dispersed in water up to 20-40 g L -1; the poly(N-propargyl glycine) was not soluble in water. Turbidity measurements of the three water-soluble polypeptoids illustrated cloud point temperatures dependent on structural and electronic properties of the side chain. The cloud point temperatures were found to increase in the order C3 = n-propyl (15-25 C) allyl (27-54 C) isopropyl (47-58 C). Long-term annealing of the aqueous solution of poly(N-{n-propyl} glycine) and poly(N-allyl glycine) above the cloud point temperature resulted in the formation of crystalline microparticles with melting points of 188-198 and 157-165 C (differential scanning calorimetry, DSC), respectively, and rose bud type morphology (scanning electron microscopy, SEM).
2-GUANIDINO-4-OXO-IMIDAZOLINE DERIVATIVES AS ANTIMALARIAL AGENTS, SYNTHESIS AND METHODS OF USE THEREOF
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Page/Page column 66; 68, (2012/11/13)
The present invention relates to new 2-guanidino-4-oxo-imidazoline derivatives (deoxo-IZ), methods of making these compounds, compositions containing the same, and methods of using the same to prevent, treat, or inhibit malaria in a subject.
Synthesis and antimalarial activity of 2-guanidino-4-oxoimidazoline derivatives
Liu, Xianjun,Wang, Xihong,Li, Qigui,Kozar, Michael P.,Melendez, Victor,O Neil, Michael T.,Lin, Ai J.
scheme or table, p. 4523 - 4535 (2011/09/15)
A series of 2-guanidino-4-oxoimidazoline (deoxo-IZ) derivatives was prepared and showed potent antimalarial activities in rodent and Rhesus models. Compound 8e, the most potent analogues of this series, is the first non-8-aminoqinoline antimalarial that demonstrated radical curative activity in non-human primate by oral route and showed causal prophylactic activity comparable to that of the commonly used clinical drugs in Rhesus monkeys infected with sporozoites of Plasmodium cynomolgi. The metabolic stability and metabolites profile indicated that the new deoxo-IZ derivatives (8) may act as prodrugs of the corresponding IZ (1 and 2) derivatives.
Mesoionic compounds. 10. Preferred conformation of a 3-alkyl and 3-aryl-substituent in 4-unsubstituted and 4-acylated monocyclic munchnones and sydnones
Petride, Horia,Cort, Antonella Dalla,Florea, Cristina,Cǎproiu, Miron
, p. 249 - 259 (2007/10/03)
A new 4-unsubstituted monocyclic oxazolium-5-olate (7c) was generated and NMR-characterized. Several 3-alkyl- and 3-aryl-4-acylated monocyclic munchnone and sydnone derivatives were also prepared. From NMR experimental data and theoretical calculations di
Preparation of N-Boc N-alkyl glycines for peptoid synthesis
Mouna,Nguyen,Rage,Xie,Nee,Mazaleyrat,Wakselman
, p. 2429 - 2435 (2007/10/02)
A series of N-tert-butoxycarbonylated N-allyl, N-propargyl, N-benzyl or branched N-alkyl glycines, useful building blocks for the synthesis of N-alkyl glycine oligomers, have been prepared by N-alkylation of N-Boc glycine or by a two-step method: reductive alkylation and tert-butoxycarbonylation.
Preparation of N-substituted amino acids
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, (2008/06/13)
An N-substituted amino acids can be prepared by the steps of: bringing together under reaction condition glyoxal and a source of sulfur dioxide in an aqueous medium to produce a sulfonated intermediate; and introducing into said medium a nitrogen compound selected from the group consisting of ammonia, a primary amine, and a secondary amine, into said medium containing said intermediate to produce said N-substituted amino acid.
Rearrangement of Azidomalonic Esters
Frank, Juergen,Stoll, Gerhard,Musso, Hans
, p. 1990 - 1996 (2007/10/02)
Dimethyl azidomalonate (4) is photolyzed under loss of nitrogen and rearrangement of one methoxycarbonyl group to form the mixture of Z and E isomers of the α,β-unsaturated amino acid esters 8 and 9.On photolysis of isopropyl- and isobutylazidomalonates 10 migration of the alkyl group is observed exclusively.The (alkylimino)malonates 14 so formed have been hydrogenated and hydrolyzed to give the N-alkylglycine derivatives 16.
