Metal-free visible-light-induced oxidative cyclization reaction of 1,6-enynes and arylsulfinic acids leading to sulfonylated benzofurans

2020 ◽  
Vol 31 (1) ◽  
pp. 67-70 ◽  
Author(s):  
Leilei Wang ◽  
Min Zhang ◽  
Yulong Zhang ◽  
Qishun Liu ◽  
Xiaohui Zhao ◽  
...  
Keyword(s):  
Visible Light ◽  
Oxidative Cyclization ◽  
Cyclization Reaction ◽  
Metal Free

ChemInform Abstract: Synthesis of 6-Substituted Phenanthridines by Metal-Free, Visible-Light Induced Aerobic Oxidative Cyclization of 2-Isocyanobiphenyls with Hydrazines.

ChemInform ◽  
2014 ◽  
Vol 45 (36) ◽  
pp. no-no
Author(s):  
Tiebo Xiao ◽  
Linyong Li ◽  
Guoliang Lin ◽  
Qile Wang ◽  
Ping Zhang ◽  
...  
Keyword(s):  
Visible Light ◽  
Oxidative Cyclization ◽  
Metal Free

Metal-Free Oxidative C(sp3)–N Coupling by HBr and DMSO: A Novel Synthesis of 2,3-Dihydroquinazolin-4(1H)-ones

Synlett ◽  
2018 ◽  
Vol 29 (07) ◽  
pp. 912-917 ◽  
Author(s):  
Parviz Ranjbar ◽  
Narjes Rezaei ◽  
Ehsan Sheikhi
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reaction ◽  
Primary Amines ◽  
Isatoic Anhydride ◽  
Reaction Conditions ◽  
Coupling Process ◽  
Benzylic Alcohols ◽  
Metal Free ◽  
Novel Synthesis

A metal-free oxidative C(sp3)–N coupling process has been developed for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones. The reaction between primary amines, isatoic anhydride, and benzylic alcohols in the presence of HBr in DMSO at 80 °C affords 2,3-dihydroquinazolin-4(1H)-ones in excellent yields. Under these reaction conditions, benzylic alcohols react with in situ generated bromodimethylsulfonium bromide to form alkoxysulfonium intermediates. These intermediates undergo an oxidative cyclization reaction with primary amines and isatoic anhydride to produce the title products.

scholarly journals Eosin Y-catalyzed visible-light-mediated aerobic oxidative cyclization of N,N-dimethylanilines with maleimides

2015 ◽  
Vol 11 ◽  
pp. 425-430 ◽  
Author(s):  
Zhongwei Liang ◽  
Song Xu ◽  
Wenyan Tian ◽  
Ronghua Zhang
Keyword(s):  
Visible Light ◽  
Oxidative Cyclization ◽  
Eosin Y ◽  
Efficient Synthesis ◽  
One Pot ◽  
Bond Functionalization ◽  
Metal Free ◽  
Mild Conditions ◽  
Simple Strategy ◽  
Air Atmosphere

A novel and simple strategy for the efficient synthesis of the corresponding tetrahydroquinolines from N,N-dimethylanilines and maleimides using visible light in an air atmosphere in the presence of Eosin Y as a photocatalyst has been developed. The metal-free protocol involves aerobic oxidative cyclization via sp3 C–H bond functionalization process to afford good yields in a one-pot procedure under mild conditions.

Visible-light-initiated photo-oxidative cyclization of phenolic amidines using CBr4 – A metal free approach to 2-aminobenzoxazoles

RSC Advances ◽  
2014 ◽  
Vol 4 (11) ◽  
pp. 5815 ◽  
Author(s):  
Twinkle Keshari ◽  
Vishnu P. Srivastava ◽  
Lal Dhar S. Yadav
Keyword(s):  
Visible Light ◽  
Oxidative Cyclization ◽  
Metal Free

Metal-free, visible-light-promoted oxidative radical cyclization of N-biarylglycine esters: one-pot construction of phenanthridine-6-carboxylates in water

2019 ◽  
Vol 21 (16) ◽  
pp. 4406-4411 ◽  
Author(s):  
Palani Natarajan ◽  
Deachen Chuskit ◽  
Priya Priya
Keyword(s):  
Visible Light ◽  
Intramolecular Cyclization ◽  
Radical Cyclization ◽  
Cyclization Reaction ◽  
Ambient Conditions ◽  
One Pot ◽  
Light Blue ◽  
Metal Free ◽  
Air Atmosphere ◽  
Oxidative Radical Cyclization

A metal-free, visible-light (blue LED: hν = 425 ± 15 nm) photoredox-catalyzed intramolecular cyclization reaction of N-biarylglycine esters to phenanthridine-6-carboxylates in water under an open air atmosphere at ambient conditions has been developed.

Synthesis of 6-substituted phenanthridines by metal-free, visible-light induced aerobic oxidative cyclization of 2-isocyanobiphenyls with hydrazines

2014 ◽  
Vol 16 (5) ◽  
pp. 2418-2421 ◽  
Author(s):  
Tiebo Xiao ◽  
Linyong Li ◽  
Guoliang Lin ◽  
Qile Wang ◽  
Ping Zhang ◽  
...  
Keyword(s):  
Visible Light ◽  
Oxidative Cyclization ◽  
Organic Dye ◽  
Metal Free ◽  
Eosin B

Irradiation of hydrazines and 2-isocyanobiphenyls with visible-light in the presence of organic dye eosin B generates various 6-substituted phenanthridines in good yields.

Transition-metal-free oxidative cyclization reaction of enynals to access pyrane-2-one derivatives

2021 ◽  
Author(s):  
Farzaneh Ansari ◽  
Hormoz Khosravi ◽  
Alireza Abbasi Kejani ◽  
Mahsa Armaghan ◽  
Walter Frank ◽  
...  
Keyword(s):  
Transition Metal ◽  
Oxidative Cyclization ◽  
Cyclization Reaction ◽  
Metal Free

K2S2O8 is introduced as an oxygen source and C–H functionalization agent in a novel selective metal-free oxidative cyclization of enynals to synthesize α-pyrone derivatives with a relatively broad substrate scope via the formation of two C–O bonds.

Visible-Light-Promoted Synthesis of Pyrrolidinone Derivatives via Rose Bengal as a Photoredox Catalyst and Their Photophysical Studies

2021 ◽  
Author(s):  
Arup Dutta ◽  
Mostofa Ataur Rohman ◽  
Ridaphun Nongrum ◽  
Aiborlang Thongni ◽  
Sivaprasad Mitra ◽  
...  
Keyword(s):  
Visible Light ◽  
Rose Bengal ◽  
Radical Cyclization ◽  
Cyclization Reaction ◽  
Photoredox Catalysis ◽  
Blue Led ◽  
Metal Free ◽  
Photophysical Studies ◽  
Reaction Profile ◽  
Led Irradiation

An intramolecular radical cyclization reaction towards the synthesis of pyrrolidinone derivatives via metal free photoredox catalysis under blue LED irradiation has been reported. Synthetic efficiency, green reaction profile, easy isolation...

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