Results 21 to 30 of about 5,333 (179)

Borylated Cyclopentanes via Atom Transfer Radical [3+2] Annulation [PDF]

, 2023
. An atom transfer radical [3+2] annulation (ATRAn) reaction involving alkenyl boronic esters and homoallylic iodides provides a rapid access to polysubstituted borylated cyclopentanes.
Manuel, Gnägi-Lux, Fabrice, Dénès, Simon, Rohrbach, Dace, Cirule, Philippe, Renaud   +4 more
core   +2 more sources

A Facile Access to Densely Functionalized Substituted Cyclopentanes and Spiro Cyclopentanes. Carbocation Stabilization Directed Bond Migration in Rearrangement of Cyclobutanes

, 2016
A Facile Access to Densely Functionalized Substituted Cyclopentanes and Spiro Cyclopentanes.
Azizul Haque (3040599), Nanda Ghoshal (473003), Anjan Ghatak (1906138), Subrata Ghosh (124413)   +3 more
core   +2 more sources

The preparation of several 1,2,3,4,5-functionalized cyclopentane derivatives

Beilstein Journal of Organic Chemistry, 2013
With the goal of eventually synthesizing [5]radialene (3), the still missing member of the parent radialene hydrocarbons, we have prepared the pentaacetates 21 and 31, the pentabromide 29 and the hexabromide 32.
André S. Kelch, Peter G. Jones, Ina Dix, Henning Hopf   +3 more
doaj   +1 more source

Convergent Evolution of Diastereomeric Mixtures of 5-Methoxy-pentylzirconocenes toward Trans-1,2-substituted Cyclopentanes

, 2021
International audienceThe access to 1,2- and 1,1,2-substituted trans cyclopentanes via a sequential hydrozirconation/TMSOTf-mediated cyclization applied to 5-methoxypent-1-enes is presented. Involving a transient carbocation, the reaction was shown to be
Coelho, Aurélien, Machado-Rodrigues, Carine, Vasse, Jean-Luc, Behr, Jean-Bernard   +3 more
core   +1 more source

Access to Spirooxindole-Fused Cyclopentanes via a Stereoselective Organocascade Reaction Using Bifunctional Catalysis

, 2023
The present study reports an asymmetric organocascade reaction of oxindole-derived alkenes with 3-bromo-1-nitropropane efficiently catalyzed by the bifunctional catalyst. Spirooxindole-fused cyclopentanes were produced in moderate-to-good isolated yields
Vojtěch Dočekal (11160300), Simona Petrželová (14514489), Jan Veselý (1843195), Andrea Vopálenská (11160303), Ivana Císařová (1580947)   +4 more
core   +3 more sources

Enantioselective Construction of Spirocyclic Oxindolic Cyclopentanes by Palladium-Catalyzed Trimethylenemethane-[3+2]-Cycloaddition

, 2016
The palladium catalyzed [3+2] trimethylenemethane (TMM) cycloaddition is an efficient method for the construction of cyclopentanes. Herein, we report a catalytic asymmetric protocol for the synthesis of spirocyclic oxindolic cyclopentanes in excellent ...
Barry M. Trost (1309395), Nicolai Cramer (1516678), Steven M. Silverman (2103688)   +2 more
core   +2 more sources

Highly enantio-stereoselective Ni-catalyzed reductive cyclization to cyclopentanes with chiral quaternary centres of trisubstituted allylic siloxanes

Green Synthesis and Catalysis
The construction of chiral quaternary carbon stereocenters is a significant challenge in asymmetric synthesis. Catalytic synthesis of these structures with trisubstituted allylic alcohols is highly important.
Wanjun Chen, Xinlong Yan, Lin Fan, Xu Guo, Jian Yang, Yiming Chen, Shaofang Zhou, Guodu Liu   +7 more
doaj   +1 more source

Heavy‐Atom Tunneling at Room Temperature Revealed by Instanton Theory

Angewandte Chemie, Volume 138, Issue 45, 2 November 2026.
Usually, tunneling does not play a significant role in chemical reactions except at low temperature, especially when heavy atoms are involved. However, using nonadiabatic instanton theory we find that heavy‐atom tunneling dominates the reaction mechanism for spin‐forbidden processes in the synthesis of strained organic molecules even at room ...
Debaarjun Mukherjee, Kamil D. Petryczkiewicz, Jeremy O. Richardson   +2 more
wiley   +2 more sources

5-endo-trig Radical Cyclizations:  A New Means to the Stereoselective Synthesis of Cyclopentanes and Diquinanes

, 2016
5-endo-trig Radical Cyclizations:  A New Means to the Stereoselective Synthesis of Cyclopentanes and ...
Stéphane Bogen (2995686), Max Malacria (1737190)   +1 more
core   +2 more sources

Encapsulation of Linear and Cyclic Alkanes in Water Within a Dimeric Deep‐Cavity Sulfonatocalix[4]arene Capsule

Chemistry – A European Journal, EarlyView.
Captured in water. A tetrasulfonated deep‐cavity calix[4]arene encapsulates linear and cyclic alkanes, as well as benzene and hexafluorobenzene, in water by forming a self‐assembled dimeric capsule. The binding affinity is guest size‐dependent. For linear alkanes, the affinity peaks at n‐hexane, while cyclooctane is the most strongly bound cycloalkane.
Nico Schneider, Sebastiano Casalino, Aldrik H. Velders, Rosa M. Gomila, Antonio Frontera, Stefan Kubik   +5 more
wiley   +1 more source