Development of atropisomeric P, N-type ligands and their applications in Suzuki-Miyaura coupling

Pao Yue-kong Library Electronic Theses Database

Development of atropisomeric P, N-type ligands and their applications in Suzuki-Miyaura coupling

 

Author: Lee, Dong-sheng
Title: Development of atropisomeric P, N-type ligands and their applications in Suzuki-Miyaura coupling
Degree: Ph.D.
Year: 2014
Subject: Ligands
Organic compounds -- Synthesis.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Applied Biology and Chemical Technology
Pages: xv, 270 leaves : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2747240
URI: http://theses.lib.polyu.edu.hk/handle/200/7460
Abstract: Biaryl structural motif is an important skeleton in natural products from various origins and has a wide range of biological properties. Indeed, SuzukiMiyaura coupling is one of the most widely used approaches for the construction of the biaryl skeleton due to its high compatibility of functional groups and relatively environmentally benign of the side products. Hemilabile P,N-type ligands have recently become a popular topic of organometallic research. Such ligands consist of strongly bonding phosphino groups and weakly coordinating nitrogen moieties for late transition-metal. This thesis describes the development of tunable atropisomeric P,N-type ligand containing benzimidazolyl indole backbone and their applications in SuzukiMiyaura cross-coupling of aryl chlorides and arylboronic acids. This new series of ligands embodies a highly tunable, yet easily accessible main skeleton with a hemilabile coordinating site. Its high efficacy for Suzuki-Miyaura cross-coupling of aryl chlorides in the presence of low Pd-catalyst loading (0.0025%) was found and highly challenging tri-ortho-substituted biaryl synthesis was achieved. Moreover, we have attempted to develop chiral P,N-ligands containing benzimidazolyl indole backbone. The asymmetric SuzukiMiyaura cross-coupling employing these chiral P,N-ligands has been explored. The experimental results showed that (S, Ra)-L6-Ph is an efficient ligand to facilitate asymmetric SuzukiMiyaura cross-coupling with moderate enantioselectivity (ee = 28%) in 73% yield at 70 °C. It is our pursuit to develop efficient chiral catalyst for high value chiral molecule syntheses, especially in the field of asymmetric SuzukiMiyaura coupling. These studies potentially offer a new direction in the design and synthesis of highly active chiral catalysts.

Files in this item

Files Size Format
b27472401.pdf 15.55Mb PDF
Copyright Undertaking
As a bona fide Library user, I declare that:
  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

     

Quick Search

Browse

More Information