Results 111 to 120 of about 5,623 (241)

Highly Efficient Asymmetric [3+2] Cycloaddition Promoted by Chiral Aziridine-Functionalized Organophosphorus Compounds

open access: yesMolecules
The asymmetric [3+2] cycloaddition of azomethine ylides generated from the corresponding imino ester-to-trans-β-nitrostyrene catalysis by chiral aziridine-containing phosphines and phosphine oxides is described. Of the sixteen stereoisomers that could be
Julia Szymańska   +2 more
doaj   +1 more source

A one-pot synthesis of tetrahydroisoquinolin-4-ols via a novel acid-catalyzed rearrangement of 5-aryloxazolidines [PDF]

open access: yes, 2013
Benzaldehydes with electron-donating substituents react smoothly with a nonstabilized azomethine ylide derived from sarcosine and formaldehyde to form 5-aryloxazolidines as intermediates, which undergo rearrangement into 2-methyl-1,2,3,4 ...
Moshkin, V. S., Sosnovskikh, V. Y.
core   +1 more source

Addition of azomethine ylides to carbon-encapsulated iron nanoparticles

open access: yesDalton Transactions, 2018
Carbon-encapsulated iron nanoparticles have been covalently functionalized using the Prato reaction.
Artur Kasprzak   +6 more
openaire   +4 more sources

The modification of brucine derivatives as chiral ligands and its application in the asymmetric synthesis [PDF]

open access: yes, 2014
The modification of brucine derivatives as chiral ligands and the use of a multifaceted chiral ligand, brucine diol, under different reaction conditions to produce various optical isomers is described.
Li, Jian-Yuan
core   +2 more sources

A novel SWCNT platform bearing DOTA and b-cyclodextrin units. "One shot" multidecoration under microwave irradiation. [PDF]

open access: yes, 2014
The functionalization of single-walled carbon nanotubes (SWCNTs) via microwave-assisted grafting reactions enables efficient multidecoration in a single step.
Barge, Alessandro   +7 more
core   +1 more source

Kinetic Resolution of Alkylidene Norcamphors via a Ligand-Controlled Umpolung-Type 1,3-Dipolar Cycloaddition

open access: yesiScience, 2019
Summary: Development of a general catalytic and highly efficient method utilizing readily available precursors for the regio- and stereoselective construction of bioactive natural-product-inspired spiro architectures remains a formidable challenge in ...
Chong Shen   +5 more
doaj  

Topological Woodward-Hoffmann classification for cycloadditions in polycyclic aromatic azomethine ylides [PDF]

open access: yesarXiv
The study of cycloaddition mechanisms is central to the fabrication of extended sp2 carbon nanostructures. Reaction modeling in this context has focused mostly on putative, energetically preferred, exothermic products with limited consideration for symmetry allowed or forbidden mechanistic effects.
arxiv  

Enantioselective Synthesis of exo-4-Nitroprolinates from Nitro­alkenes and Azomethine Ylides Catalyzed by Chiral Phosphor­amidite·Silver(I) or Copper(II) Complexes [PDF]

open access: yes, 2015
Chiral complexes formed by privileged phosphoramidites derived from chiral binol and optically pure Davies’ amines, and copper(II) triflate, silver(I) triflate or silver(I) benzoate are excellent catalysts for the general 1,3-dipolar cycloaddition ...
Castelló Moncayo, Luis Miguel   +5 more
core   +2 more sources

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