Synthesis of bicyclic 2-pyridones by regioselective annulations of heterocyclic ketene aminals with anhydrides

RSC Advances ◽  
2016 ◽  
Vol 6 (105) ◽  
pp. 103057-103064 ◽  
Author(s):  
Jin Liu ◽  
Sheng-Jiao Yan ◽  
Zheng-Mao Cao ◽  
Shi-Sheng Cui ◽  
Jun Lin
Keyword(s):  
Efficient Strategy ◽  
Ketene Aminals

An efficient strategy for the synthesis of substituted bicyclic 2-pyridones is developed. The proposed approach is based on the regioselective N-acylation of heterocyclic ketene aminals (HKAs) with methacrylic anhydride or crotonic anhydride.

A Memory-efficient Strategy for the FDTD Implementation Applied to the Photonic Crystals Problems

PIERS Online ◽  
2007 ◽  
Vol 3 (4) ◽  
pp. 374-378 ◽  
Author(s):  
Yu Liu ◽  
Ziqiang Yang ◽  
Zheng Liang ◽  
Limei Qi
Keyword(s):  
Photonic Crystals ◽  
Efficient Strategy ◽  
Memory Efficient

Cascade CuH-Catalyzed Conversion of Alkynes to Enantioenriched 1,1-Disubstituted Products

2019 ◽  
Author(s):  
De-Wei Gao ◽  
Yang Gao ◽  
Huiling Shao ◽  
Tian-Zhang Qiao ◽  
Xin Wang ◽  
...  
Keyword(s):  
Organic Synthesis ◽  
Medicinal Chemistry ◽  
Proteasome Inhibitors ◽  
Building Blocks ◽  
Unique Role ◽  
Efficient Strategy ◽  
Carbon Centers ◽  
Rapid Access ◽  
Cascade Catalysis ◽  
Privileged Scaffolds

Enantioenriched <i>α</i>-aminoboronic acids play a unique role in medicinal chemistry and have emerged as privileged pharmacophores in proteasome inhibitors. Additionally, they represent synthetically useful chiral building blocks in organic synthesis. Recently, CuH-catalyzed asymmetric alkene hydrofunctionalization has become a powerful tool to construct stereogenic carbon centers. In contrast, applying CuH cascade catalysis to achieve reductive 1,1-difunctionalization of alkynes remains an important, but largely unaddressed, synthetic challenge. Herein, we report an efficient strategy to synthesize <i>α</i>-aminoboronates <i>via </i>CuH-catalyzed hydroboration/hydroamination cascade of readily available alkynes. Notably, this transformation selectively delivers the desired 1,1-heterodifunctionalized product in favor of alternative homodifunctionalized, 1,2-heterodifunctionalized, or reductively monofunctionalized byproducts, thereby offering rapid access to these privileged scaffolds with high chemo-, regio- and enantioselectivity.<br>

Thioether-Facilitated Iridium-Catalyzed Hydrosilylation of Steric 1,1-Disubstituted Olefins

2019 ◽  
Author(s):  
Shengtao Ding
Keyword(s):  
Side Chains ◽  
Feasible Method ◽  
Iridium Catalysis ◽  
Efficient Strategy ◽  
Terminal Alkenes ◽  
And Control ◽  
Sulfur Containing ◽  
Organosilicon Polymers

<p>One facile and efficient strategy for the hydrosilylation of steric 1,1-disubstituted terminal alkenes is demonstrated. Investigations on substrate scope and control experiments revealed the necessity of thioether in promoting this process under a simple iridium catalysis system. This convenient and feasible method is expected to be useful in the synthesis of sulfur-containing organosilicon polymers with different side-chains.</p><p><br></p>

scholarly journals The Synthesis of Conjugated Bis-Aryl Vinyl Substrates and Their Photoelectrocyclization Reactions towards Phenanthrene Derivatives

Synthesis ◽  
2021 ◽  
Author(s):  
Jon D. Rainier ◽  
Xuchen Zhao
Keyword(s):  
Natural Product ◽  
Natural Product Synthesis ◽  
Mechanistic Studies ◽  
Efficient Strategy

AbstractThe photoelectrocyclization of conjugated vinyl biaryls has proven to be a valuable and efficient strategy for generating phenanthrene derivatives. Contained in this review is an overview of the mechanism for the transformation and a discussion of the reaction scope with a focus on the electrocyclization itself, rearomatization, and the application of the reaction in natural product synthesis.1 Introduction2 The Synthesis of Conjugated Vinyl Biaryls3 Mechanistic Studies4 Substrate Scope5 Applications6 Conclusions

Iron-Catalysed Radical Cyclization to Synthesize Germanium-Substituted Indolo[2,1-a]isoquinolin-6(5H)-ones and Indolin-2-ones

2021 ◽  
Author(s):  
Yani Luo ◽  
Tian Tian ◽  
Yasushi Nishihara ◽  
Leiyang Lv ◽  
Zhiping Li
Keyword(s):  
Radical Cyclization ◽  
One Pot ◽  
Efficient Strategy

A simple and efficient strategy for iron-catalysed cascade radical cyclization was developed, by which an array of germanium-substituted indolo[2,1-a]isoquinolin-6(5H)-ones and indolin-2-ones were obtained in one pot with germanium hydrides as...

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