Catalyst-free and visible light promoted trifluoromethylation and perfluoroalkylation of uracils and cytosines

2018 ◽  
Vol 54 (97) ◽  
pp. 13662-13665 ◽  
Author(s):  
Yang Huang ◽  
Yun-Yun Lei ◽  
Liang Zhao ◽  
Jiwei Gu ◽  
Qiuli Yao ◽  
...  
Keyword(s):  
Visible Light ◽  
Catalyst Free ◽  
Simple Strategy

Here, we report a mild, catalyst-free and operationally simple strategy for the direct perfluoroalkylation of uracils, cytosines and pyridinones through a visible-light induced pathway.

Visible-light-initiated Catalyst-free Oxidative Cleavage of Triaryl-Substituted Alkenes C=C Bonds under Ambient Conditions

2021 ◽  
Author(s):  
Wenjing Li ◽  
Shun Li ◽  
Lihua Luo ◽  
Yichen Ge ◽  
Jiaqi Xu ◽  
...  
Keyword(s):  
Visible Light ◽  
Room Temperature ◽  
Ambient Air ◽  
Oxidative Cleavage ◽  
Ambient Conditions ◽  
Blue Led ◽  
Catalyst Free

The catalyst-free oxidative cleavage of (Z)-triaryl-substituted alkenes bearing pyridyl motif with ambient air under irradiation of blue LED at room temperature has been developed. The reaction was facile and scalable,...

Catalyst-Free [2,3]-Sigmatropic Rearrangement Reactions of Photochemically Generated Ammonium Ylides

Synthesis ◽  
2019 ◽  
Vol 51 (23) ◽  
pp. 4348-4358 ◽  
Author(s):  
Fang Li ◽  
Feifei He ◽  
Rene M. Koenigs
Keyword(s):  
Visible Light ◽  
Sigmatropic Rearrangement ◽  
Tertiary Amines ◽  
Amino Esters ◽  
Catalyst Free ◽  
Rearrangement Reaction ◽  
Rearrangement Reactions ◽  
Free Ammonium

The rearrangement reaction of ammonium ylides furnishes valuable α,α-disubstituted amino esters. In this work, we describe the visible-light photolysis reaction of aryldiazoacetates in the presence of tertiary amines that react via a free ammonium ylide in a sigmatropic rearrangement reaction to provide amino esters in moderate to very good yields (33 examples, up to 97% yield).

Visible-Light-Mediated Tandem Sulfonylation/Cyclization of Vinyl Azides with Sulfonyl Hydrazines for the Synthesis of 6-(Sulfonylmethyl)phenanthridines under Mild Conditions

Synlett ◽  
2019 ◽  
Vol 30 (08) ◽  
pp. 955-960 ◽  
Author(s):  
Liu-Liang Mao ◽  
Li-Xia Quan ◽  
Xian-Hong Zhu ◽  
Cong-Bin Ji ◽  
An-Xi Zhou ◽  
...  
Keyword(s):  
Visible Light ◽  
Mild Conditions ◽  
Simple Strategy ◽  
Vinyl Azides

A visible-light-mediated tandem sulfonylation/cyclization of vinyl azides with sulfonyl hydrazines was developed that provides an efficient and simple strategy for the synthesis of valuable 6-(sulfonylmethyl)phenanthridines with a broad substrate scope and satisfactory yields under mild conditions.

scholarly journals Facile Preparation of Efficient WO3Photocatalysts Based on Surface Modification

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Min Liu ◽  
Hongmei Li ◽  
Yangsu Zeng
Keyword(s):  
Photocatalytic Activity ◽  
Surface Modification ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Impregnation Method ◽  
Light Spectra ◽  
Simple Strategy ◽  
Visible Light Active ◽  
Efficient Charge ◽  
Surface Modified

Tungsten trioxide (WO3) was surface modified with Cu(II) nanoclusters and titanium dioxide (TiO2) nanopowders by using a simple impregnation method followed by a physical combining method. The obtained nanocomposites were studied by scanning electron microscope, X-ray photoelectron spectroscopy spectra, UV-visible light spectra, and photoluminescence, respectively. Although the photocatalytic activity of WO3was negligible under visible light irradiation, the visible light photocatalytic activity of WO3was drastically enhanced by surface modification of Cu(II) nanoclusters and TiO2nanopowders. The enhanced photocatalytic activity is due to the efficient charge separation by TiO2and Cu(II) nanoclusters functioning as cocatalysts on the surface. Thus, this simple strategy provides a facile route to prepare efficient visible-light-active photocatalysts for practical application.

Recent Developments on Catalyst‐Free, Visible‐Light‐Triggered Synthesis of Heterocyclic Scaffolds and Their Mechanistic Study

2021 ◽  
Vol 6 (36) ◽  
pp. 9684-9700
Author(s):  
Munmee Goswami ◽  
Arup Dutta ◽  
Pooja Paul ◽  
Rishanlang Nongkhlaw
Keyword(s):  
Visible Light ◽  
Mechanistic Study ◽  
Catalyst Free ◽  
Recent Developments

scholarly journals Visible Light Promoted, Catalyst‐Free Radical Carbohydroxylation and Carboetherification under Mild Biomimetic Conditions

2020 ◽  
Author(s):  
Lisa‐Marie Altmann ◽  
Viviane Zantop ◽  
Pia Wenisch ◽  
Nina Diesendorf ◽  
Markus R. Heinrich
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Catalyst Free

Direct C–H sulfenylation of quinoxalinones with thiols under visible-light-induced photocatalyst-free conditions

2019 ◽  
Vol 21 (23) ◽  
pp. 6241-6245 ◽  
Author(s):  
Qing-Hu Teng ◽  
Yan Yao ◽  
Wen-Xiu Wei ◽  
Hai-Tao Tang ◽  
Jia-Rong Li ◽  
...  
Keyword(s):  
Visible Light ◽  
Metal Free ◽  
Catalyst Free

We have developed a metal-free and catalyst-free visible-light-promoted direct C–H sulfenylation of quinoxalin-2(1H)-ones with thiols for the synthesis of diverse 3-sulfenylquinoxalin-2(1H)-ones.

Catalyst-free, visible-light-promoted S–H insertion reaction between thiols and α-diazoesters

2020 ◽  
Vol 18 (46) ◽  
pp. 9494-9498
Author(s):  
Jingya Yang ◽  
Ganggang Wang ◽  
Shuwen Chen ◽  
Ben Ma ◽  
Hongyan Zhou ◽  
...  
Keyword(s):  
Visible Light ◽  
Insertion Reaction ◽  
Mild Conditions ◽  
Catalyst Free

A catalyst- and additive-free, visible-light-promoted S–H insertion reaction between thiols and α-diazoesters has been developed under mild conditions.

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