Results 131 to 140 of about 25,436 (256)

New Chiral Auxiliaries For The [3+2]-Cycloaddition Of Nonstabilised Azomethine Ylides [PDF]

open access: yes, 1999
The [3+2]-cycloaddition reaction of nonstabilised azomethine ylides to alkenes is a valuable synthetic method for the assembly of functionalised pyrrolidines.
Jensen, Allan Rostrup Forup
core  

Influence of Endo- and Exocyclic Heteroatoms on Stabilities and 1,3-Dipolar Cycloaddition Reactivities of Mesoionic Azomethine Ylides and Imines [PDF]

open access: yes, 2017
The geometries, stabilities, and 1,3-dipolar cycloaddition reactivities of 24 mesoionic azomethine ylides and imines were investigated using density functional theory calculations at the M06-2X/6-311+G-(d,p)/M06-2X/6-31G-(d) level.
Champagne, Pier Alexandre, Houk, KN
core   +1 more source

Acyl Imidazole : A Promising Template for Asymmetric Lewis and Brønsted Acid Mediated 1,3-Dipolar Cycloadditions [PDF]

open access: yes, 2011
Construction of chiral complex molecules continues to be a challenge for organic chemists all over the world and to address this challenge numerous methodologies have been developed.
Rane, Digamber Sadanand
core  

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  

Construction of the 5,10b‐Phenanthridine Skeleton Using [3+2]‐Cycloaddition of a Non‐Stabilized Azomethine Ylide: Total Synthesis of (±)‐Maritidine and (±)‐Crinine Alkaloids

open access: yes, 2011
Vicinal quaternary and tertiary stereocenters of the 5,10b-phenanthridine skeleton 1 are constructed simultaneously in one step by the [3+2]-cycloaddition of non-stabilized azomethine ylide 9, generated by sequential double desilylation of 10 utilizing ...
G. Pandey, Nishant R Gupta, S. Gadre
semanticscholar   +1 more source

Ex Situ Covalent Functionalization of Germanene via 1,3-Dipolar Cycloaddition:A Promising Approach for the Bandgap Engineering of Group-14 Xenes [PDF]

open access: yes
Group-14 Xenes beyond graphene such as silicene, germanene, and stanene have recently gained a lot of attention for their peculiar electronic properties, which can be tuned by covalent functionalization.
Giousis, Theodosis   +9 more
core   +1 more source

Synthesis, pharmacokinetics, and biological use of lysine-modified single-walled carbon nanotubes

open access: yesInternational Journal of Nanomedicine, 2014
J Justin Mulvey,1,2 Evan N Feinberg,1,3 Simone Alidori,1 Michael R McDevitt,4,5 Daniel A Heller,1,6 David A Scheinberg1,5,6 1Molecular Pharmacology and Chemistry Program, Sloan Kettering Institute, New York, NY, USA; 2Tri-Institutional MD-PhD Program ...
Mulvey JJ   +5 more
doaj  

2,5-Di-tert-butyl-2,5-diethylpyrrolidine-1-oxyls: Where Is a Reasonable Limit of Sterical Loading for Higher Resistance to Reduction?

open access: yesMolecules
The pyrrolidine nitroxides with four bulky alkyl substituents adjacent to the N–O∙ group demonstrate very high resistance to reduction with biogenic antioxidants and enzymatic systems.
Irina F. Zhurko   +4 more
doaj   +1 more source

Synthetic and DNA cross-linking studies of bioxalomycinα₂ [PDF]

open access: yes, 1999
1999 Fall.Includes bibliographical references.The preparation of a [3 + 2] cycloaddition precursor towards the total synthesis of bioxalomycin α2 is presented. The route contains four key steps.
Herberich, Bradley James
core  

Home - About - Disclaimer - Privacy