Cycloadditions to 1,1‐Dicyclopropylethylene [PDF]
Angewandte Chemie International Edition in English, 1969 While the stabilization of cationic centers by alpha cyclopropyl groups has been verified in many instances [2,31, to the best of our knowledge nothing is known about the influenceof cyclopropyl groups, as substituents, on the reaction mechanism of multiple bonds. The α-cyclopropylcarbonium ions 141 that may be formed are capable of rearrangement, thus
Effenberger, Franz, Podszun, Wolfgang
openaire +3 more sources
Visible light promoted [3+2]-cycloaddition in the synthesis of cyclopenta[b]chromenocarbonitrile derivatives [PDF]
, 2023 In the manuscript, a novel method for the preparation of cyclopenta[b]chromenocarbonitrile derivatives via [3+2] cycloaddition reaction of substituted 3-cyanochromones and N-cyclopropyloamines initiated by visible light catalysis in the presence of Eosin
Angelika, Artelska +3 more
core +2 more sources
Acta Crystallographica Section E: Crystallographic Communications, 2019 In the title compounds, C32H25ClN2O4 (I) and C33H28N2O5 (II), the six-membered pyran and piperidine rings adopt envelope and chair conformations, respectively. The five-membered pyrrolidine rings adopt twist conformations. Compound (II) crystallizes with
S. Syed Abuthahir +4 more
doaj +1 more source
Synthesis and reinvestigation of tetrazocines [PDF]
, 2004 This thesis is concerned with the study of tetrazocines. These rare, eight-membered ring systems containing four nitrogen atoms are in the infancy of their development. Little is known of their potential application, properties and generation.
Healy, Cathal
core +2 more sources
Catalyzing the (3+2) Cycloaddition of Neutral TACs: Towards a Generalization of the CuAAC Reactivity Principles [PDF]
, 2023 The introduction of the copper-catalyzed azide-alkyne coupling (CuAAC) to 1,3-dipolar cycloadditions was pivotal to their popularization in synthetic chemistry and to their application to multiple other domains of science.
Alice, Pommainville +3 more
core +2 more sources
Bioinspired Intramolecular Diels-Alder Cycloaddition for the Total Synthesis of Ophiorrhine A via Ophiorrhine G and Ophiorrhiside E [PDF]
, 2022 We report the first total synthesis of the monoterpene indole alkaloids ophiorrhine A via a late stage bioinspired intramolecular Diels-Alder cycloaddition to form the intricate bridged and spirannic polycyclic system.
Cyrille , Kouklovsky +3 more
core +1 more source
Combining Iminium and Supramolecular Catalysis for the [4 + 2] Cycloaddition of E-Cinnamaldehydes [PDF]
, 2022 Herein we describe a method for combining supramolecular catalysis with imininum-based organocatalysis in the Diels–Alder cycloaddition reaction. Notably, both cage and L-proline are required for the reaction to occur, implying that encap-sulation of the
Michael, Young +3 more
core +1 more source
Novel Polyurethane-Catalyzed Cyclic Carbonate Synthesis Using CO2 and Epoxide [PDF]
, 2020 The conversion of industrially produced greenhouse gases, like CO2, into value-added chemicals is economically beneficial to industry and vital for environmental conservation.
Nakatani, Hisayuki +4 more
core +1 more source
Cycloaddition of Cyano-2-pyridones Bearing a Bromo or a Nitro Group [PDF]
, 2007 Cycloaddition of cyano-2(1H)-pyridones bearing a bromo or a nitro group at the pyridone ring with 2,3-dimethyl-1,3-butadiene carried out. Cycloaddition of 5-bromo-4-cyanopyridone gave cis- and trans-cycloadducts (isoquinolone derivative) in total yields ...
Fujita, Reiko +11 more
core
Highly Regioselective Construction of Spirocycles via Phosphine-Catalyzed [3 + 2]-Cycloaddition
, 2016 A direct entry to spirocycles with low to moderate regioselectivity was achieved by triphenylphosphine-catalyzed [3 + 2]-cycloaddition of active exo-methylenecycles (1) and ethyl 2,3-butadienoate (2).
Xiyan Lu (1470865) +2 more
core +1 more source