Xiangyang Lei

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Organization: Lamar University

Department: Department of Chemistry and Biochemistry

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TOPICS

Organic Chemistry

suzuki-miyaura Coupling

Chemicals
References

Synthesis of Diaryl Sulfones at Room Temperature: Cu-Catalyzed Cross-Coupling of Arylsulfonyl Chlorides with Arylboronic Acids

Co-reporter:Dr. Feng Hu ;Dr. Xiangyang Lei

ChemCatChem 2015 Volume 7( Issue 10) pp:1539-1542

Publication Date(Web):

DOI:10.1002/cctc.201500174

Abstract

An efficient and convenient method for the synthesis of diaryl sulfones was developed through the Cu-catalyzed cross-couplings of arylsulfonyl chlorides and arylboronic acids at room temperature in open air. This method is characterized by the use of inexpensive and readily available catalyst and substrates, mild reaction conditions, wide functionality tolerance, short reaction times for most substrates, and moderate to good yields.

Inside Cover: Synthesis of Diaryl Sulfones at Room Temperature: Cu-Catalyzed Cross-Coupling of Arylsulfonyl Chlorides with Arylboronic Acids (ChemCatChem 10/2015)

Co-reporter:Dr. Feng Hu ;Dr. Xiangyang Lei

ChemCatChem 2015 Volume 7( Issue 10) pp:

Publication Date(Web):

DOI:10.1002/cctc.201500474

Diaminophosphine oxides as preligands for Ni-catalyzed Suzuki cross-coupling reactions of aryl chlorides with arylboronic acids

Co-reporter:Feng Hu, Blessy N. Kumpati, Xiangyang Lei

Tetrahedron Letters 2014 Volume 55(Issue 52) pp:7215-7218

Publication Date(Web):24 December 2014

DOI:10.1016/j.tetlet.2014.11.020

The first investigation of air- and moisture-stable diaminophosphine oxides as preligands in the Ni-catalyzed Suzuki cross-coupling reactions of aryl chlorides with arylboronic acids has been reported. The results show that under the optimized reaction conditions, the new catalytic system with a Ni(II) σ-aryl complex as precatalyst and a diaminophosphine oxide as preligand tolerates a variety of functional groups and is efficient for both electron-rich and electron-deficient aryl chlorides, though it shows higher efficiency for activated arylboronic acids than deactivated ones. Steric effects were observed for both aryl chlorides and arylboronic acids.

A nickel precatalyst for efficient cross-coupling reactions of aryl tosylates with arylboronic acids: vital role of dppf

Co-reporter:Feng Hu, Xiangyang Lei

Tetrahedron 2014 70(25) pp: 3854-3858

Publication Date(Web):

DOI:10.1016/j.tet.2014.04.059

SuzukiMiyaura coupling reactions of aryl chlorides catalyzed by a new nickel(II) -aryl complex

Co-reporter:Xiangyang Lei;Karla A. Obregon ;Jhansi Alla

Applied Organometallic Chemistry 2013 Volume 27( Issue 7) pp:419-424

Publication Date(Web):

DOI:10.1002/aoc.3000

A new nickel(II) σ-aryl complex, trans-chloro(9-phenanthrenyl)bis(triphenylphosphine)nickel(II), was used as a precatalyst for the Suzuki–Miyaura coupling reactions of aryl chlorides. The catalytic conditions were optimized by investigating the cross-coupling of p-chloroanisole with phenylboronic acid. The results show that this complex is efficient for both electron-rich and electron-deficient aryl chlorides, though it gives better yields for activated arylboronic acids than deactivated ones. All isolated cross-coupled biaryl products have been characterized by ¹H and ¹³C NMR, and their spectral data are consistent with those reported. Side products from the coupling of arylboronic acid with the precatalyst complex have also been isolated and characterized, which is helpful for understanding the coupling mechanism. Copyright © 2013 John Wiley & Sons, Ltd.

Dioxomolybdenum(VI) complexes with linear and tripodal tetradenate ligands: Synthesis, structures and their use as olefin epoxidation catalysts

Co-reporter:Xiangyang Lei, Nagasree Chelamalla

Polyhedron 2013 Volume 49(Issue 1) pp:244-251

Publication Date(Web):25 January 2013

DOI:10.1016/j.poly.2012.10.022

A series of linear and tripodal tetradentate ligands containing an amine-bis(phenolate) core were synthesized by Mannich condensations. Treatment of these ligands with MoO2(acac)2 (acac = acetylacetonate) in dichloromethane and methanol at room temperature gave the corresponding cis-dioxomolybdenum(VI) complexes in good yields. All these complexes were characterized by a wide range of spectroscopic methods (NMR, IR, and UV–Vis) and elemental analysis. The molecular structures of complexes MoO2(Ln) (n = 1–3, 5) were confirmed by single-crystal X-ray diffraction analysis. The catalytic activities of all complexes towards the epoxidation of styrene by tert-butyl hydroperoxide have also been investigated.Graphical abstractSeveral dioxomolybdenum(VI) complexes with linear and tripodal tetradentate amine-bis(phenolate) ligands were synthesized in good yields. Their X-ray structures show cis-dioxo distorted octahedral geometry. The catalytic activities of these complexes towards the epoxidation of styrene by tert-butyl hydroperoxide have been investigated.Highlights► Several linear and tripodal tetradentate amine-bis(phenolate) ligands were synthesized. ► Dioxomolybdenum(VI) complexes with above ligands were prepared in good yields. ► All these complexes were characterized by NMR, IR, UV–Vis, and elemental analysis. ► X-ray structures of these complexes show cis-dioxo distorted octahedral geometry. ► All these complexes were evaluated as catalysts for the epoxidation of styrene.