Results 21 to 30 of about 108,077 (187)

Titanium-Mediated Carbometallation of Homoallylic Alcohols [PDF]

, 2012
Addition of zinc dichloride as an additive allows for the titanium-mediated carbometalation of homoallylic alcohols with Grignard reagents. The zinc dichloride additive successfully inhibits the B-hydride elimination of the titanium intermediate.
Peng, Bo
core   +3 more sources

Vanadium-Catalyzed Asymmetric Epoxidation of Homoallylic Alcohols [PDF]

Journal of the American Chemical Society, 2006
New chiral bishydroxamic acids were synthesized and tested as chiral ligands in the vanadium-catalyzed asymmetric epoxidation of homoallylic alcohols to provide good yields and high enantioselectivities.
Wei, Zhang, Hisashi, Yamamoto
openaire   +2 more sources

Preparation of Homoallylic Homopropargylic Alcohols from 2‐Vinyloxiranes. [PDF]

ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
Matthew L, Maddess, Mark, Lautens
openaire   +2 more sources

Catalytic enantioselective epoxidation of tertiary allylic and homoallylic alcohols. [PDF]

J Am Chem Soc, 2013
An efficient and versatile method for the enantioselective epoxidation of both tertiary allylic and homoallylic alcohols catalyzed by Hf(IV)-bishydroxamic acid (BHA) complexes is described. Asymmetric epoxidation, kinetic resolution, and desymmetrization have been developed, demonstrating the flexible nature of the Hf(IV)-BHA system.
Olivares-Romero JL, Li Z, Yamamoto H.
europepmc   +4 more sources

Vanadium-Catalyzed Asymmetric Epoxidation of Homoallylic Alcohols

, 2016
New chiral bishydroxamic acids were synthesized and tested as chiral ligands in the vanadium-catalyzed asymmetric epoxidation of homoallylic alcohols to provide good yields and high ...
Wei Zhang (405), Hisashi Yamamoto (1306170)   +1 more
core   +2 more sources

A green access to supported cinchona alkaloid amide catalysts for heterogeneous enantioselective allylsilylation of aldehydes and process intensity evaluation in batch and flow

Green Synthesis and Catalysis, 2022
We report herein a new class of polystyrene-supported cinchona alkaloid amide catalysts for enantioselective allylation of various aldehydes using allyltrichlorosilane under both batch and continuous flow conditions.
Xiao Qian Ng, Ming Han Kang, Ren Wei Toh, Valerio Isoni, Jie Wu, Yu Zhao   +5 more
doaj   +1 more source

Allylation of Functionalized Aldehydes by Potassium Allyltrifluoroborate Catalyzed by 18-Crown-6 in Aqueous Media

Molecules, 2012
An efficient method for the allylation of aldehydes containing a broad range of functional groups using potassium allyltrifluoroborate is described.
Roberta A. Oliveira, Paulo H. Menezes, Caio F. Melo, Juliano C. R. Freitas, Fernanda C. G. Barbosa   +4 more
doaj   +1 more source

Asymmetric Syntheses of (E)-Hydroxymethyl-anti-homoallylic Alcohols via Highly Enantio- and Stereoselective Aldehyde Allylation with Borylmethyl(E)crotylboronate

, 2021
Highly stereo- and enantioselective synthesis of (E)-δ-hydroxymethyl-anti-homoallylic alcohols is reported. Under the developed conditions, reactions between aldehydes and chiral nonracemic α-borylmethyl-(E)-crotylboronate upon oxidative workup gave δ ...
Jiaming Liu (187759), Shang Gao (1525495), Jiaming Liu, Ming Chen (115604), Shang Gao, Ming Chen   +5 more
core   +1 more source

Synthesis of spiroannulated and 3-arylated 1,2,4-trioxanes from mesitylol and methyl 4-hydroxytiglate by photooxygenation and peroxyacetalization

Beilstein Journal of Organic Chemistry, 2010
Cycloalkanones were utilized in the Lewis acid catalyzed peroxyacetalization of ß-hydroperoxy homoallylic alcohols (prepared by the ene reaction of the allylic alcohols mesitylol and methyl 4-hydroxytiglate, respectively, with singlet oxygen) to give ...
Axel G. Griesbeck, Lars-Oliver Höinck, Jörg M. Neudörfl   +2 more
doaj   +1 more source

NbCl₅-Mg Reagent System in Regio- and Stereoselective Synthesis of (2Z)-Alkenylamines and (3Z)-Alkenylols from Substituted 2-Alkynylamines and 3-Alkynylols

Molecules, 2021
The reduction of N,N-disubstituted 2-alkynylamines and substituted 3-alkynylols using the NbCl5–Mg reagent system affords the corresponding dideuterated (2Z)-alkenylamine and (3Z)-alkenylol derivatives in high yields in a regio- and stereoselective ...
Rita N. Kadikova, Azat M. Gabdullin, Oleg S. Mozgovoj, Ilfir R. Ramazanov, Usein M. Dzhemilev   +4 more
doaj   +1 more source