scholarly journals Transition-metal-free base catalyzed intramolecular cyclization of 2-ynylphenols for efficient and facile synthesis of 2-substituted benzo[b]furans

RSC Advances ◽  
2018 ◽  
Vol 8 (50) ◽  
pp. 28637-28641 ◽  
Author(s):  
Yong Liu ◽  
Tao Lu ◽  
Wei-Fang Tang ◽  
Jian Gao
Keyword(s):  
Transition Metal ◽  
Intramolecular Cyclization ◽  
Free Base ◽  
Facile Synthesis ◽  
Metal Free

An efficient and practical transition-metal-free synthesis of 2-substituted benzo[b]furans catalyzed by readily accessible base was developed with broad substrates scope.

Transition-metal-free and facile synthesis of 3-alkynylpyrrole-2, 4-dicarboxylates from methylene isocyanides and propiolaldehyde

2021 ◽  
Author(s):  
Xiaoli Huo ◽  
Xiaojuan Chen ◽  
Liya Yu ◽  
Chong Zhang ◽  
Linghui Zeng ◽  
...  
Keyword(s):  
Transition Metal ◽  
Efficient Method ◽  
Transformation Process ◽  
Facile Synthesis ◽  
Direct Transformation ◽  
Metal Free

A transition-metal-free, facile and efficient method for the synthesis of 3-alkynylpyrrole-2, 4-dicarboxylates from methylene isocyanides and propiolaldehyde with moderate to good yields has been developed. The direct transformation process and...

Visible light driven metal-free intramolecular cyclization: a facile synthesis of 3-position substituted 3,4-dihydroisoquinolin-1(2H)-one

2019 ◽  
Vol 17 (2) ◽  
pp. 380-387 ◽  
Author(s):  
Shuai Zou ◽  
Shu Geng ◽  
Lina Chen ◽  
Haitao Wang ◽  
Feng Huang
Keyword(s):  
Visible Light ◽  
Intramolecular Cyclization ◽  
Facile Synthesis ◽  
Metal Free ◽  
Visible Light Driven

Visible light driven metal-free intramolecular cyclization: a facile synthesis of 3-position substituted 3,4-dihydroisoquinolin-1(2H)-one.

Facile Access to Triazole-Fused 3,1-Benzoxazines Enabled by Metal-Free Base-Promoted Intramolecular C–O Coupling

Synthesis ◽  
2021 ◽  
Author(s):  
Yury N. Kotovshchikov ◽  
Stepan S. Tatevosyan ◽  
Gennadij V. Latyshev ◽  
Nikolay V. Lukashev ◽  
Irina P. Beletskaya
Keyword(s):  
Transition Metal ◽  
Functional Group ◽  
Cost Effective ◽  
Reductive Cleavage ◽  
Effective Procedure ◽  
Free Base ◽  
Metal Free ◽  
Fused Heterocycles ◽  
Convenient Approach

AbstractA convenient approach to assemble 1,2,3-triazole-fused 4H-3,1-benzoxazines has been developed. Diverse alcohol-tethered 5-iodotriazoles, readily accessible by a modified protocol of Cu-catalyzed (3+2)-cycloaddition, were utilized as precursors of the target fused heterocycles. The intramolecular C–O coupling proceeded efficiently under base-mediated transition-metal-free conditions, furnishing cyclization products in yields up to 96%. Suppression of the competing reductive cleavage of the C–I bond was achieved by the use of Na2CO3 in acetonitrile at 100 °C. This practical and cost-effective procedure features a broad substrate scope and valuable functional group tolerance.

Transition metal-free base-promoted arylation of sulfenate anions with diaryliodonium salts

2019 ◽  
Vol 6 (1) ◽  
pp. 32-35 ◽  
Author(s):  
Lei Wang ◽  
Mingjie Chen ◽  
Junliang Zhang
Keyword(s):  
Transition Metal ◽  
Free Base ◽  
Metal Free ◽  
Diaryliodonium Salts

A base-promoted formal arylation of general sulfenate anions with diaryliodonium salts under transition-metal-free conditions has been described.

Transition Metal‐Free, Base‐Induced Arylation of Amino Acids: Synthesis of N ‐( para ‐Substituted phenyl)amino‐2‐carboxylic acids

2020 ◽  
Vol 5 (28) ◽  
pp. 8644-8648 ◽  
Author(s):  
Adejoke D. Osinubi ◽  
Josephat U. Izunobi ◽  
Olayinka T. Asekun ◽  
Oluwole B. Familoni ◽  
Xiaoguang Bao
Keyword(s):  
Amino Acids ◽  
Transition Metal ◽  
Carboxylic Acids ◽  
Free Base ◽  
Metal Free

Access to Furo[2,3‐ b ]pyridines by Transition‐Metal‐Free Intramolecular Cyclization of C3‐substituted Pyridine N ‐oxides

2018 ◽  
Vol 7 (5) ◽  
pp. 879-882 ◽  
Author(s):  
Dong Wang ◽  
Meng Shen ◽  
Yuxi Wang ◽  
Jianyong Hu ◽  
Junjie Zhao ◽  
...  
Keyword(s):  
Transition Metal ◽  
Intramolecular Cyclization ◽  
Metal Free

One-pot transition-metal-free cascade synthesis of thieno[2,3-c]coumarins from chromones

RSC Advances ◽  
2016 ◽  
Vol 6 (106) ◽  
pp. 103895-103898 ◽  
Author(s):  
Yuhong Yang ◽  
Xueyu Qi ◽  
Ruiling Liu ◽  
Qian He ◽  
Chunhao Yang
Keyword(s):  
Transition Metal ◽  
Cascade Reaction ◽  
Free Base ◽  
One Pot ◽  
Metal Free

A one-pot transition-metal-free, base-mediated synthesis of a novel series of functionalized thieno[2,3-c]coumarins has been developed through a cascade reaction from chromones.

Synthesis of Imidazo[1,5-a]quinolines via Metal-Free Oxidative Amination of sp3 C–H Bonds

Synthesis ◽  
2018 ◽  
Vol 50 (14) ◽  
pp. 2761-2767 ◽  
Author(s):  
Chen Ma ◽  
Huanhuan Liu ◽  
Xinfeng Wang
Keyword(s):  
Amino Acids ◽  
Transition Metal ◽  
Intramolecular Cyclization ◽  
Efficient Synthesis ◽  
Oxidative Amination ◽  
Metal Free ◽  
Oxidation System

A novel oxidative amination of sp3 C–H bonds was developed for the efficient synthesis of imidazo[1,5-a]quinolines from readily available α-amino acids and (2-azaaryl)methanes. This domino protocol, which was established in a TBAI-TBHP oxidation system, includes transition-metal-free decarboxylation and intramolecular cyclization. This method represented a new avenue for the synthesis of N-heterocycles using 2-methylquinolines as the synthon of quinoline-2-carbaldehydes.

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