Lewis acid-catalyzed 2-arylquinazoline formation from N′-arylbenzimidamides and paraformaldehyde

2016 ◽  
Vol 18 (21) ◽  
pp. 5773-5776 ◽  
Author(s):  
Xiufang Cheng ◽  
Huamin Wang ◽  
Fuhong Xiao ◽  
Guo-Jun Deng
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Efficient Procedure ◽  
Metal Free ◽  
Acid Catalyzed

An efficient procedure for the synthesis of 2-arylquinazolines from N′-arylbenzimidamides has been developed under transition-metal-free conditions.

Synthesis and Applications of Chiral Bicyclic Bisborane Catalysts

Synthesis ◽  
2021 ◽  
Author(s):  
Zhao-Ying Yang ◽  
Ming Zhang ◽  
Xiao-Chen Wang
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Asymmetric Hydrogenation ◽  
Acid Catalysts ◽  
Frustrated Lewis Pairs ◽  
Lewis Acid Catalysts ◽  
Lewis Bases ◽  
Metal Free ◽  
Hydrogenation Reactions ◽  
Acid Catalyzed

The development of chiral borane Lewis acid catalysts opened the door for transition-metal-free catalyzed asymmetric organic reactions. Herein, we have summarized our work on the preparation of two classes of novel chiral bicyclic bisborane Lewis acid catalysts derived from C2-symmetric [3.3.0] dienes and [4.4] dienes, respectively. These catalysts not only form frustrated Lewis pairs with Lewis bases to catalyze asymmetric hydrogenation reactions but also activate Lewis basic functional groups in traditional Lewis acid catalyzed asymmetric reactions.

scholarly journals Metal-Free Catalysts for the Polymerization of Alkynyl-Based Monomers

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 1 ◽  
Author(s):  
Jie Zhang ◽  
Zhiming Zhang ◽  
Fulin Yang ◽  
Haoke Zhang ◽  
Jingzhi Sun ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Research Focus ◽  
Catalytic Systems ◽  
Metal Free ◽  
Catalyst Free ◽  
Material Sciences ◽  
Acid Catalyzed

Novel polymerizations based on alkyne monomers are becoming a powerful tool to construct polymers with unique structures and advanced functions in the areas of polymer and material sciences, and scientists have been attracted to develop a variety of novel polymerizations in recent decades. Therein, catalytic systems play an indispensable role in the influence of polymerization efficiencies and the performances of the resultant polymers. Concerning the shortcomings of metallic catalysts, much of the recent research focus has been on metal-free polymerization systems. In this paper, metal-free catalysts are classified and the corresponding polymerizations are reviewed, including organobase-catalyzed polymerizations, Lewis-acid-catalyzed polymerizations, as well as catalyst-free polymerizations. Moreover, the challenges and perspectives in this area are also briefly discussed.

Development of silica-supported frustrated Lewis pairs: highly active transition metal-free catalysts for the Z-selective reduction of alkynes

2016 ◽  
Vol 6 (3) ◽  
pp. 882-889 ◽  
Author(s):  
Kai C. Szeto ◽  
Wissam Sahyoun ◽  
Nicolas Merle ◽  
Jessica Llop Castelbou ◽  
Nicolas Popoff ◽  
...  
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Selective Reduction ◽  
Frustrated Lewis Pairs ◽  
Acid Base ◽  
Metal Free ◽  
Highly Active ◽  
Active Transition ◽  
Lewis Pairs

Supported Lewis acid/base systems based have been prepared and characterized.

Novel Naproxen Derivatives: Lewis Acid/Transition-metal Free Synthesis via C-C Bond Forming Reaction

2007 ◽  
Vol 4 (4) ◽  
pp. 292-295 ◽  
Author(s):  
Sarbani Pal ◽  
P. Bindu ◽  
Pragnyadhar Reddy Venna ◽  
P. K. Dubey
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Metal Free ◽  
Bond Forming

scholarly journals Transition-Metal-Free [3+2] Dehydration Cycloaddition of Donor-Acceptor Cyclopropanes With 2-Naphthols

2021 ◽  
Vol 9 ◽  
Author(s):  
Hua Zhao ◽  
Peng Shen ◽  
Dongru Sun ◽  
Hongbin Zhai ◽  
Yufen Zhao
Keyword(s):  
Transition Metal ◽  
Ring Opening ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Cyclization Reaction ◽  
Metal Free ◽  
Efficient Access ◽  
Donor Acceptor ◽  
Acid Catalyzed ◽  
Synthetic Application

A Brønsted acid-catalyzed domino ring-opening cyclization transformation of donor-acceptor (D-A) cyclopropanes and 2-naphthols has been developed. This formal [3+2] cyclization reaction provided novel and efficient access to the naphthalene-fused cyclopentanes in the absence of any transition-metal catalysts or additives. This robust procedure was completed smoothly on a gram-scale to afford the corresponding product with comparable efficiency. Furthermore, the synthetic application of the prepared product has been demonstrated by its transformation into a variety of synthetically useful molecules.

A Metal‐Free, Organo Lewis Acid Catalyzed Synthesis of Highly Substituted Oxazoles

2019 ◽  
Vol 4 (31) ◽  
pp. 8973-8977 ◽  
Author(s):  
Gullapalli Kumaraswamy ◽  
Maram Gangadhar
Keyword(s):  
Lewis Acid ◽  
Metal Free ◽  
Acid Catalyzed

Transition Metal/Lewis Acid Catalyzed Reactions of Zerumbone for Diverse Molecular Motifs

2021 ◽  
Author(s):  
Mohanan Biji ◽  
Bernard Prabha ◽  
Ravi S. Lankalapalli ◽  
Kokkuvayil Vasu Radhakrishnan
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Acid Catalyzed ◽  
Catalyzed Reactions

ChemInform Abstract: Metal-Free Reductions of N-Heterocycles via Lewis Acid Catalyzed Hydrogenation.

ChemInform ◽  
2010 ◽  
Vol 41 (47) ◽  
pp. no-no
Author(s):  
Stephen J. Geier ◽  
Preston A. Chase ◽  
Douglas W. Stephan
Keyword(s):  
Lewis Acid ◽  
Metal Free ◽  
Acid Catalyzed
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