Homochiral bifunctional L-prolinamide- and L-bis-prolinamide-catalyzed asymmetric aldol reactions performed in wet solvent-free conditions.
Sign Up to like & getrecommendations! Published in 2020 at "Chirality"
DOI: 10.1002/chir.23283
Abstract: In this study, the novel bifunctional homochiral thiourea-L-prolinamides 1-4, tertiary amino-L-prolinamide 5, and bis-L-prolinamides 6 and 7 were prepared from enantiomerically pure (11R,12R)-11,12-diamino-9,10-dihydro-9,10-ethanoanthracene 8 and (11S,12S)-11,12-diamino-9,10-dihydro-9,10-ethanoanthracene ent-8. Highly enantioselective and diastereoselective aldolic intermolecular reactions (up… read more here.
Keywords: free conditions; solvent free; homochiral bifunctional; prolinamide bis ... See more keywords
An efficient one-pot synthesis of highly functionalized benzylpyrazolyl pyrido[1,2-a]pyrimidine derivatives using CuFe2O4 nanoparticles under solvent-free conditions
Sign Up to like & getrecommendations! Published in 2017 at "Research on Chemical Intermediates"
DOI: 10.1007/s11164-017-3022-4
Abstract: An efficient and green protocol for the synthesis of novel benzylpyrazolyl pyrido[1,2-a]pyrimidine derivatives via three-component reaction of aryl aldehydes, 2-hydroxy-4H-pyrido[1,2-a]pyrimidine-4-ones, and 3-methyl-1-phenyl-1H-pyrazol-5-one has been reported using a magnetically separable and reusable heterogeneous copper ferrite (CuFe2O4)… read more here.
Keywords: free conditions; benzylpyrazolyl pyrido; pyrimidine derivatives; pyrimidine ... See more keywords
The magnetic nanostructured natural hydroxyapatite (HAP/Fe3O4 NPs): an efficient, green and recyclable nanocatalyst for the synthesis of biscoumarin derivatives under solvent-free conditions
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DOI: 10.1007/s11164-019-03788-2
Abstract: The magnetic nanostructured natural hydroxyapatite (HAP/Fe3O4 NPs) as a novel magnetic nanocatalyst was synthesized and fully characterized. The excellent catalytic activity of HAP/Fe3O4 NPs was investigated in the synthesis of biscoumarin derivatives under mild, green… read more here.
Keywords: free conditions; fe3o4 nps; hap fe3o4; solvent free ... See more keywords
Efficient and selective oxidation of tertiary benzylic C H bonds with O2 catalyzed by metalloporphyrins under mild and solvent-free conditions
Sign Up to like & getrecommendations! Published in 2020 at "Applied Catalysis A: General"
DOI: 10.1016/j.apcata.2020.117599
Abstract: Abstract The direct and efficient oxidation of tertiary benzylic C H bonds to alcohols with O2 was accomplished in the presence of metalloporphyrins as catalysts under solvent-free and additive-free conditions. Based on effective inhibition on… read more here.
Keywords: free conditions; oxidation; tertiary benzylic; oxidation tertiary ... See more keywords
Natrolite zeolite: A natural and reusable catalyst for one-pot synthesis of α-aminophosphonates under solvent-free conditions
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DOI: 10.1016/j.arabjc.2012.11.011
Abstract: Abstract α-Aminophosphonates are synthesized efficiently by one-pot reaction of aldehydes or ketones, amines, trialkyl phosphites in the presence of Natrolite zeolite as a natural catalyst under solvent-free conditions. Furthermore, the catalyst can be reused several… read more here.
Keywords: free conditions; solvent free; one pot; zeolite natural ... See more keywords
Recyclable Rh-PVP nanoparticles catalyzed hydrogenation of benzoic acid derivatives and quinolines under solvent-free conditions
Sign Up to like & getrecommendations! Published in 2019 at "Catalysis Communications"
DOI: 10.1016/j.catcom.2019.02.019
Abstract: Abstract Various transition metal nanoparticles, prepared by microwave-assisted alcohol reduction method were examined for hydrogenation of benzoic acid to cyclohexanecarboxylic acid under solvent-free conditions. Rh metal was the most effective catalyst over other metal catalyst.… read more here.
Keywords: free conditions; benzoic acid; hydrogenation benzoic; hydrogenation ... See more keywords
TEMPO and its derivatives mediated reactions under transition-metal-free conditions
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DOI: 10.1016/j.cclet.2019.06.027
Abstract: Abstract 2,2,6,6-Tetramethyl-1-piperidinyl-N-oxyl (TEMPO) and its derivatives as stable radicals can participate in many reactions. During the process, TEMPO and its derivatives could act not only as the substrates to capture or initiate new radical intermediates… read more here.
Keywords: transition metal; free conditions; metal free; tempo derivatives ... See more keywords
Hypervalent iodine mediated C-H amination of quinoxalinones with heteroaromatic amines under metal-free conditions
Sign Up to like & getrecommendations! Published in 2021 at "Chinese Chemical Letters"
DOI: 10.1016/j.cclet.2021.02.018
Abstract: Abstract An efficient and facile method for C–H amination of quinoxalinones with heteroaromatic amines under metal-free conditions has been described. In the presence of hypervalent PIDA reagent, the desired products with various groups were obtained… read more here.
Keywords: amines metal; heteroaromatic amines; free conditions; amination quinoxalinones ... See more keywords
Active ruthenium(II)-NHC complexes for alkylation of amines with alcohols using solvent-free conditions
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DOI: 10.1016/j.poly.2019.114234
Abstract: Abstract A series of new ruthenium(II) complexes bearing N-heterocyclic carbene ligands with benzylic groups were prepared by transmetallation reactions between silver(I) N-heterocyclic carbene complexes and [RuCl2(p-cymene)]2. All of the obtained complexes were characterized by FT-IR,… read more here.
Keywords: ruthenium; free conditions; active ruthenium; alkylation ... See more keywords
Quantifying CDOM and DOC in major Arctic rivers during ice-free conditions using Landsat TM and ETM+ data
Sign Up to like & getrecommendations! Published in 2018 at "Remote Sensing of Environment"
DOI: 10.1016/j.rse.2018.02.060
Abstract: Abstract As high-latitudes warm, permafrost thaws, and the hydrological cycle accelerates, ground-based monitoring of riverine organic matter may be supplemented by satellite remote sensing during ice-free conditions. Recent programs, namely the Arctic Great Rivers Observatory,… read more here.
Keywords: free conditions; ice free; doc; cdom ... See more keywords
Derivation and characterization of the NIH registry human stem cell line NYSCF101 under defined feeder-free conditions.
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DOI: 10.1016/j.scr.2018.04.017
Abstract: The human embryonic stem cell line NYSCFe002-A was derived from a day 6 blastocyst in feeder-free and antibiotic free conditions. The blastocyst was voluntarily donated for research as surplus after in vitro fertilization treatment following… read more here.
Keywords: free conditions; cell line; line; feeder free ... See more keywords