Results 21 to 30 of about 20,154 (280)

Polyoxygenated Cyclohexenes and Their Chlorinated Derivatives from the Leaves of Uvaria cherrevensis.

Journal of Natural Products, 2019
The chemical study of leaf extracts from Uvaria cherrevensis resulted in the identification of 11 new polyoxygenated cyclohexenes, cherrevenols A-K (1-11), and a new seco-cyclohexene derivative, cherrevenol L (12).
Chiramet Auranwiwat, Puttandon Wongsomboon, Thanaphat Thaima, R. Rattanajak, S. Kamchonwongpaisan, A. Willis, S. Laphookhieo, S. Pyne, T. Limtharakul   +8 more
semanticscholar   +1 more source

Highly-functionalised difluorinated cyclohexane polyols via the Diels–Alder reaction : regiochemical control via the phenylsulfonyl group [PDF]

, 2005
A difluorinated dienophile underwent cycloaddition reactions with a range of furans to afford cycloadducts whichcould be processed regio- and stereoselectively via episulfonium ions, generated by the reaction between their alkenyl groups and ...
Crowley, Patrick J, Fawcett, John, Griffith, Gerry A, Moralee, Andrew C, Percy, Jonathan, Salafia, Vittoria   +5 more
core   +1 more source

Highly Functionalized Cyclohexenes Derived from Benzene: Sequential Tandem Addition Reactions Promoted by Tungsten.

Journal of Organic Chemistry, 2019
The dihapto-coordination of benzene to the π-basic fragment {TpW(NO)(PMe3)} (Tp = hydridotris(pyrazolyl)-borate) enhances the basicity of the arene ligand to the point that it can be protonated with a mild Brønsted acid (diphenylammonium triflate; p Ka ∼
Katy B. Wilson, Jacob A. Smith, Hannah S Nedzbala, Emmit K Pert, Steven J. Dakermanji, D. Dickie, W. Harman   +6 more
semanticscholar   +1 more source

Fluorination of some functionalized cycloalkenes through epoxidation and oxirane opening with Deoxofluor or XtalFluor-E [PDF]

, 2017
A convenient, simple synthetic method is described for the synthesis of some fluorinecontaining, highly functionalized cycloalkane derivatives. The synthetic protocol involves the stereoselective epoxidation of selected substituted cyclohexenes as model ...
Fülöp, Ferenc, Kiss, Loránd, Remete, Attila Márió   +2 more
core   +2 more sources

Synthesis of highly substituted allenylsilanes by alkylidenation of silylketenes [PDF]

, 2005
BACKGROUND: Allenylsilanes are useful intermediates in organic synthesis. An attractive, convergent but little used approach for their synthesis is the alkylidenation of stable silylketenes.
Ducept, P.C., Marsden, S.P.
core   +3 more sources

Halide Bond Assisted Double Desymmetrization of Meso‐Dicarboxylic Acids with Symmetrical Olefins via Asymmetric Halogenation

Angewandte Chemie, EarlyView.
This work demonstrates a double desymmetrization of meso‐dicarboxylic acids with symmetrical olefins, constructing complex chiral lactones with six stereocenters in one step. Unexpectedly, the halide bond was found to be crucial in achieving high stereoselectivity.
Qingyu Zhang, Haihui Wang, Ying‐Lung Steve Tse, Ying‐Yeung Yeung   +3 more
wiley   +2 more sources

Stereodivergent Synthesis of Three Contiguous Stereogenic Centers by Cu/Ir‐Catalyzed Borylallylation

Angewandte Chemie, EarlyView.
An alkene borylallylation strategy enabled by cooperative Cu/Ir‐catalysis has been uncovered for accessing three contiguous stereogenic centres. This strategy is notable given the inherent challenges of constructing molecules with multiple stereocenters while maintaining high selectivity bearing diverse functional groups.
Suman Das, Stanna K. Dorn, M. Kevin Brown   +2 more
wiley   +2 more sources

Enantioselective Synthesis of Spirobarbiturate-Cyclohexenes through Phosphine-Catalyzed Asymmetric [4 + 2] Annulation of Barbiturate-Derived Alkenes with Allenoates.

Organic Letters, 2016
An enantioselective synthesis of pharmaceutically important spirobarbiturates has been achieved via spirocyclic chiral phosphine-catalyzed asymmetric [4 + 2] annulation of barbiturate-derived alkenes with allenoates.
Honglei Liu, Yang Liu, Chunhao Yuan, Guo-Peng Wang, Shou‐Fei Zhu, Yang Wu, Bo Wang, Zhanhu Sun, Yumei Xiao, Qi‐Lin Zhou, Hongchao Guo   +10 more
semanticscholar   +1 more source

Direct esterification of allylic C(sp3)–H via iron nanoparticle–loaded kaolin-catalyzed cross dehydrogenative coupling

Green Chemistry Letters and Reviews
Iron is the most abundant transition metal on Earth. In this study, we have demonstrated an iron nanoparticle–loaded kaolin-catalyzed cross dehydrogenative coupling (CDC) reaction via C(sp3)–H activation.
Dao Su, Tegshi Muschin, Yun Wu, Yong-Sheng Bao   +3 more
doaj   +1 more source

Highly Enantioselective Kinetic Resolution of Michael Adducts through N-Heterocyclic Carbene Catalysis: An Efficient Asymmetric Route to Cyclohexenes.

Chemistry, 2018
A highly efficient strategy for the kinetic resolution of Michael adducts was realized using a chiral N-heterocyclic carbene catalyst. The kinetic resolution provides a new convenient route to single diastereomers of cyclohexenes and Michael adducts in ...
Xiang-Yu Chen, Sun Li, Qiang Liu, Mukesh Kumar, A. Peuronen, K. Rissanen, D. Enders   +6 more
semanticscholar   +1 more source