Results 51 to 60 of about 5,087 (177)

N-Heterocyclic carbene-catalyzed diastereoselective synthesis of β-lactone-fused cyclopentanes using homoenolate annulation reaction

, 2015
NHC-catalyzed annulation of enals with 2-enoylpyridines or 2-enoylpyridine N-oxides leading to the diastereoselective synthesis of β-lactone-fused cyclopentanes is reported. The reaction proceeds via the generation of homoenolate equivalent intermediates
Gonnade, Rajesh G., Mukherjee, Subrata, Patra, Atanu, Mondal, Santigopal, Biju, Akkattu T.   +4 more
core   +1 more source

Synthetic Studies on Cyclopentane Derivatives

Agricultural and Biological Chemistry, 1969
An alternative route to dl-prostaglandin-B1 using the Grignard reaction of 2-(6′-tert-butyloxycarbonylhexyl)-3-methoxy-2-cyclopenten-1-one(XII) with 3-tetrahydropyranyloxy-1-octyne was developed.An easy synthesis of dihydrojasmone was also described.
Junki KATSUBE, Masanao MATSUI
openaire   +3 more sources

Enantioselective construction of spirocyclic oxindolic cyclopentanes by palladium-catalyzed trimethylenemethane-[3+2]-cycloaddition

The palladium catalyzed [3+2] trimethylenemethane (TMM) cycloaddn. is an efficient method for the construction of cyclopentanes. Herein, a catalytic asym. protocol for the synthesis of spirocyclic oxindolic cyclopentanes, e.g., I, is reported.
Silverman, Steven M., Trost, Barry M., Cramer, Nicolai   +2 more
core   +1 more source

Theoretical investigation of atomic oxygen erosion mechanisms of 1,3-didecyl cyclopentane, 1,3-dioctyldodecyl cyclopentane and alkylated cyclopentane

RSC Adv., 2014
Atomic oxygen erosion mechanisms of 1,3-didecyl cyclopentane, 1,3-dioctyldodecyl cyclopentane and alkylated cyclopentane.
Jingyan Nian, Ping Gao, Yongcheng Wang, Zhiguang Guo, Weimin Liu   +4 more
openaire   +1 more source

One-pot asymmetric cyclocarbohydroxylation sequence for the enantioselective synthesis of functionalised cyclopentanes

, 2010
International audienceA new method has been developed for the enantioselective synthesis of highly functionalised cyclopentanes bearing up to three stereogenic centres with very high stereoselectivity.
Jean-Pierre Dulcère, Dulcère, Jean-Pierre, Jean Rodriguez, Damien Bonne, Rodriguez, Jean, Grégory Lettieri, Wilfried Raimondi, Raimondi, Wilfried, Lettieri, Grégory, Bonne, Damien   +9 more
core   +1 more source

Asymmetric Synthesis Of Multifunctional Cyclopentanes And Cyclohexanes Via Oxycarbenium Ion Cyclizations Of 5-alkoxy-2(3H)-dihydrofuranones

, 1995
Intramolecular nucleophilic additions to oxycarbenium ions derived from 5-alkoxy-2(3)-dihydrofuranones gave substituted cyclopentanes or cyclohexanes in good yields. Stereoselectivity in these reactions was usually very high, while regioselectivity could
Geertsema, Edzard M.,, Oeveren, Arjan van, Meetsma, Auke,, Geertsema, E.M.,, Oeveren, A. van,, Oeveren, Arjan van,, Geertsema, Edzard M., Meetsma, Auke, Feringa, Ben L.,, Feringa, B.L.,, Leung, Chiu W., Feringa, Bernard, Leung, C.W.,, Leung, Chiu W.,   +13 more
core   +1 more source

A ring closing metathesis based approach for the spiroannulation of cyclopentanes and cyclohexanes. Formal synthesis of (+/-)-acorones

, 2001
An efficient ring closing metathesis (RCM.) reaction based approach was developed for the spiroannulation of cyclopentanes and cyclohexanes and its utility demonstrated in the formal synthesis of the spirosesquiterpenes ...
Babu, NC, Gharpure, SJ, Srikrishna, A, Rao, MS   +3 more
core   +1 more source

FORMATION OF HIGHLY SUBSTITUTED CYCLOPENTANES FROM RADICAL AND ANIONIC MICHAEL CYCLIZATIONS OF ALPHA-IODO-GAMMA-LACTONES AND ALPHA-IODO-DELTA-LACTONES

, 1994
α-Iodo-δ- and -γ-hexonlactones with α,β-unsaturated esters developed from C-6 undergo both tributyltin hydride-induced radical and base catalysed anionic Michael cyclisations to form bicyclic lactones with very highly substituted homochiral cyclopentanes.
Kenneth Y. Hsia, HSIA, K, Peter Ward, Paul M. de Q. Lilley, WATKIN, D, FLEET, G, David J. Watkin, George W.J. Fleet, WARD, P, R. Brian Lamont, LILLEY, P, LAMONT, R   +11 more
core   +1 more source

Conjugated Diene-Assisted Allylic C−H Bond Activation: Cationic Rh(I)-Catalyzed Syntheses of Polysubstituted Tetrahydropyrroles, Tetrahydrofurans, and Cyclopentanes from Ene-2-Dienes

, 2016
Conjugated Diene-Assisted Allylic C−H Bond Activation: Cationic Rh(I)-Catalyzed Syntheses of Polysubstituted Tetrahydropyrroles, Tetrahydrofurans, and Cyclopentanes from Ene-2 ...
Zhi-Xiang Yu (1505023), Qian Li (114642)
core   +1 more source

Ti(II)-Mediated Tandem Inter- and Intramolecular Coupling Reaction of Unsaturated Hydrocarbons:  One-Pot Preparation of Cyclopentanes and Cyclohexanes from Readily Available Acyclic Starting Materials

, 2016
Ti(II)-Mediated Tandem Inter- and Intramolecular Coupling Reaction of Unsaturated Hydrocarbons:  One-Pot Preparation of Cyclopentanes and Cyclohexanes from Readily Available Acyclic Starting ...
Sentaro Okamoto (1702069), Fumie Sato (2681434), Kandasamy Subburaj (2982975)   +2 more
core   +1 more source