Recent development of synthetic preparation methods for guanidines via transition metal catalysis

2015 ◽  
Vol 51 (2) ◽  
pp. 254-265 ◽  
Author(s):  
Wen-Xiong Zhang ◽  
Ling Xu ◽  
Zhenfeng Xi
Keyword(s):  
Transition Metal ◽  
Transition Metal Catalysis ◽  
Preparation Methods ◽  
Metal Catalysis ◽  
Transition Metal Catalyzed ◽  
Catalyzed Reactions ◽  
Metal Catalyzed

This article provides an overview of guanidine synthesis via transition-metal-catalyzed reactions including cycloaddition, guanylation and tandem guanylation/cyclization.

Peptide macrocyclization by transition metal catalysis

2020 ◽  
Vol 49 (7) ◽  
pp. 2039-2059 ◽  
Author(s):  
Daniel G. Rivera ◽  
Gerardo M. Ojeda-Carralero ◽  
Leslie Reguera ◽  
Erik V. Van der Eycken
Keyword(s):  
Transition Metal ◽  
Transition Metal Catalysis ◽  
Metal Catalysis ◽  
Conformational Constraints ◽  
Transition Metal Catalyzed ◽  
Catalyzed Reactions ◽  
Metal Catalyzed

Peptide macrocyclization continues expanding with the development of novel transition metal-catalyzed reactions capable of both introducing conformational constraints and generating diversity at the ring-closing moiety.

The C–H functionalization of N-alkoxycarbamoyl indoles by transition metal catalysis

2021 ◽  
Vol 19 (37) ◽  
pp. 7949-7969
Author(s):  
Prasanjit Ghosh ◽  
Sajal Das
Keyword(s):  
Natural Products ◽  
Transition Metal ◽  
Transition Metal Catalysis ◽  
Metal Catalysis ◽  
Transition Metal Catalyzed ◽  
Metal Catalyzed

Indole and its congeners are ubiquitous nitrogen containing organic scaffolds found in a plethora of natural products. This review aims to highlight the transition-metal catalyzed C–H functionalization of N-alkoxycarbamoyl indoles.

scholarly journals Recent Developments in Transition-Metal Catalyzed Direct C–H Alkenylation, Alkylation, and Alkynylation of Azoles

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4970
Author(s):  
Su Chen ◽  
Prabhat Ranjan ◽  
Leonid G. Voskressensky ◽  
Erik V. Van der Eycken ◽  
Upendra K. Sharma
Keyword(s):  
Transition Metal ◽  
Transition Metal Catalysis ◽  
Significant Progress ◽  
Metal Catalysis ◽  
Bond Functionalization ◽  
Recent Advances ◽  
Regioselective Alkylation ◽  
Recent Developments ◽  
Transition Metal Catalyzed ◽  
Metal Catalyzed

The transition metal-catalyzed C–H bond functionalization of azoles has emerged as one of the most important strategies to decorate these biologically important scaffolds. Despite significant progress in the C–H functionalization of various heteroarenes, the regioselective alkylation and alkenylation of azoles are still arduous transformations in many cases. This review covers recent advances in the direct C–H alkenylation, alkylation and alkynylation of azoles utilizing transition metal-catalysis. Moreover, the limitations of different strategies, chemoselectivity and regioselectivity issues will be discussed in this review.

Transition metal-catalyzed direct nucleophilic addition of C–H bonds to carbon–heteroatom double bonds

2014 ◽  
Vol 5 (6) ◽  
pp. 2146-2159 ◽  
Author(s):  
Xi-Sha Zhang ◽  
Kang Chen ◽  
Zhang-Jie Shi
Keyword(s):  
Transition Metal ◽  
Nucleophilic Addition ◽  
Transition Metal Catalysis ◽  
Grignard Reaction ◽  
Double Bonds ◽  
Metal Catalysis ◽  
Transition Metal Catalyzed ◽  
Metal Catalyzed

Compared with the traditional Grignard reaction, direct insertion of polar double bonds to C–H bonds via transition-metal catalysis is ideal from the viewpoint of atom-, step- and cost-economy and the avoidance of the waste emission, as well as of the complex manipulation of sensitive reagents.

Transition-metal-catalyzed nucleophilic dearomatization of electron-deficient heteroarenes

Synthesis ◽  
2021 ◽  
Author(s):  
Jie Jia ◽  
Fangdong Hu ◽  
Ying Xia
Keyword(s):  
Transition Metal ◽  
Asymmetric Catalysis ◽  
Short Review ◽  
Transition Metal Catalysis ◽  
Powerful Method ◽  
Metal Catalysis ◽  
Unique Method ◽  
Transition Metal Catalyzed ◽  
Metal Catalyzed

Transition-metal-catalyzed nucleophilic dearomatization of electron-deficient heteroarenes, such as pyridines, quinolines, isoquinolines and nitroindoles, has become a powerful method for the access of unsaturated heterocycles in recent decades. This short review summarizes nucleophilic dearomatization of electron-deficient heteroarenes with carbon- and heteroatom-based nucleophiles via transition-metal catalysis. A great number of functionalized heterocycles were obtained in this transformation. Importantly, many of these reactions were carried out in an enantioselective manner by means of asymmetric catalysis, providing a unique method for the construction of enantioenriched heterocycles. 1 Introduction 2 Transition-metal-catalyzed nucleophilic dearomatization of heteroarenes via alkynylation 3 Transition-metal-catalyzed nucleophilic dearomatization of heteroarenes via arylation 4 Transition-metal-catalyzed nucleophilic dearomatization of heteroarenes with other nucleophiles 5 Transition-metal-catalyzed nucleophilic dearomatization with nucleophiles formed in situ 6 Conclusion and outlook

Potassium tris(triflyl)methide (KCTf3): a broadly applicable promoter for cationic metal catalysis

2015 ◽  
Vol 51 (72) ◽  
pp. 13740-13743 ◽  
Author(s):  
Junbin Han ◽  
Zhichao Lu ◽  
Weibo Wang ◽  
Gerald B. Hammond ◽  
Bo Xu
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Acid Catalysis ◽  
Wide Spectrum ◽  
Reaction Rates ◽  
Transition Metal Catalysis ◽  
Neutral Salt ◽  
Metal Catalysis ◽  
Catalyzed Reactions ◽  
Metal Catalyzed

KCTf3 enhanced the reaction rates and the chemical yields of a wide spectrum of cationic metal catalyzed reactions in consistent and significant manner. These reactions include traditional Lewis acid catalysis and transition metal catalysis. KCTf3 is an easily handled neutral salt that is commercially available.

Synthesis of N-Heterocycles via Transition-Metal-Catalyzed Tandem Addition/Cyclization of a Nitrile

Synthesis ◽  
2020 ◽  
Vol 52 (06) ◽  
pp. 819-833 ◽  
Author(s):  
Jen-Chieh Hsieh ◽  
Haw-Lih Su
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Nucleophilic Addition ◽  
Radical Addition ◽  
Transition Metal Catalysis ◽  
Late Transition Metal ◽  
Metal Catalysis ◽  
Transition Metal Catalyzed ◽  
Late Transition ◽  
Metal Catalyzed

The diverse methodologies to synthesize N-heterocycles through transition-metal-catalyzed cascade addition/cyclization of a nitrile are discussed in this review. Aspects relating to three types of transition-metal-catalyzed addition of a nitrile with subsequent cyclization include (1) a transition-metal acting as a Lewis acid to accelerate the nucleophilic addition of a nitrile, (2) the late-transition-metal-catalyzed 1,2-insertion of a nitrile, and (3) an in situ generated radical by transition-metal catalysis to implement a radical addition/cyclization tandem reaction. Applications for the synthesis of natural alkaloids, their derivatives, and some bioactive compounds are also summarized herein.1 Introduction2 Nucleophilic Addition of a Nitrile Accelerated by a Lewis Acid2.1 Late-Transition-Metal Catalysis2.2 Early-Transition-Metal Catalysis2.3 Lanthanide-Metal Catalysis2.4 Cyclization from N-Arylnitriliums3 Transition-Metal-Catalyzed Insertion of a Nitrile4 Transition-Metal-Catalyzed Radical Addition of a Nitrile5 Conclusions

C–H functionalization of quinazolinones by transition metal catalysis

2020 ◽  
Vol 18 (24) ◽  
pp. 4497-4518 ◽  
Author(s):  
Prasanjit Ghosh ◽  
Bhaskar Ganguly ◽  
Sajal Das
Keyword(s):  
Natural Products ◽  
Transition Metal ◽  
Transition Metal Catalysis ◽  
Important Class ◽  
Metal Catalysis ◽  
Bond Functionalization ◽  
Transition Metal Catalyzed ◽  
Metal Catalyzed

Quinazolinone and its derivatives are an important class of heterocyclic scaffolds in pharmaceuticals and natural products. This review provides the recent research advances in the transition metal catalyzed selective C–H bond functionalization of quinazolinone.

Merging photoredox catalysis with transition metal catalysis: site-selective C4 or C5-H phosphonation of 8-aminoquinoline amides

2017 ◽  
Vol 4 (10) ◽  
pp. 1981-1986 ◽  
Author(s):  
Huijie Qiao ◽  
Suyan Sun ◽  
Yue Zhang ◽  
Hongmei Zhu ◽  
Xiaomeng Yu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Transition Metal Catalysis ◽  
Photoredox Catalysis ◽  
Metal Catalysis ◽  
Transition Metal Catalyzed ◽  
Metal Catalyzed ◽  
Site Selective

A simple and efficient protocol for the transition metal-catalyzed site-selective C–H phosphonation of 8-aminoquinoline at the C4 or C5 positions via a photoredox process was developed.

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