Oxidative Cyclization Reaction of 2-Aryl-Substituted Cinnamates To Form Phenanthrene Carboxylates by Using MoCl5

2014 ◽  
Vol 20 (39) ◽  
pp. 12463-12469 ◽  
Author(s):  
Kathrin Wehming ◽  
Moritz Schubert ◽  
Gregor Schnakenburg ◽  
Siegfried R. Waldvogel
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reaction

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.

A Surprising Formation of Novel Bridged Bis-Benzimidazoles by Oxidation of Diaminoquinoxalines

2012 ◽  
Vol 67 (4) ◽  
pp. 367-372 ◽  
Author(s):  
Jens Preßler ◽  
Rainer Beckert ◽  
Sven Rau ◽  
Roberto Menzel ◽  
Eckhard Birckner ◽  
...  
Keyword(s):  
Visible Spectrum ◽  
Oxidative Cyclization ◽  
Cyclization Reaction ◽  
High Melting ◽  
Strong Fluorescence ◽  
Blue Region ◽  
Derivatives Of

A synthesis of novel hexacyclic bis-benzimidazoles 6 starting from 2,3-diarylamino-quinoxalines via an oxidative cyclization cascade is described. These very stable and high-melting derivatives are featured by their strong fluorescence in the blue region of the visible spectrum. The cyclization reaction between 2,3-dichloroquinoxaline and 1,2-phenylenediamine did not lead to derivatives of type 6. In this case, only fluoflavine 7 was isolated quantitatively.

Oxidative transformation of N-substituted 2-aminophenols to 2-substituted benzoxazoles catalyzed by polymer-incarcerated and carbon-stabilized platinum nanoclusters

2012 ◽  
Vol 90 (3) ◽  
pp. 306-313 ◽  
Author(s):  
Woo-Jin Yoo ◽  
Hao Yuan ◽  
Hiroyuki Miyamura ◽  
Shū Kobayashi
Keyword(s):  
Composite Material ◽  
Carbon Black ◽  
Aerobic Oxidation ◽  
Oxidative Cyclization ◽  
Cyclization Reaction ◽  
Oxidative Transformation ◽  
Platinum Nanoclusters

The preparation of 2-substituted benzoxazoles was achieved through a sequential aerobic oxidation – enolization – oxidative cyclization reaction of N-substituted 2-aminophenols catalyzed by platinum nanoclusters supported on a polymer / carbon black composite material.

NHC-catalyzed oxidative cyclization reaction for the synthesis of 3-substituted phthalides

2014 ◽  
Vol 12 (15) ◽  
pp. 2388-2393 ◽  
Author(s):  
So Won Youn ◽  
Hyoung Sub Song ◽  
Jong Hyub Park
Keyword(s):  
Michael Addition ◽  
Functional Group ◽  
Addition Reaction ◽  
Oxidative Cyclization ◽  
Cyclization Reaction ◽  
Michael Addition Reaction ◽  
Stereogenic Center

An efficient NHC-catalyzed domino oxidation/oxa-Michael addition reaction of 2-alkenylbenzaldehydes has been developed to afford 3-substituted phthalides bearing a C3-stereogenic center with a broad substrate scope and wide functional group tolerance.

Oxidative Cyclization Reaction of 2-Aryl-Substituted Cinnamates To Form Phenanthrene Carboxylates by Using MoCl5

2014 ◽  
Vol 20 (39) ◽  
pp. 12329-12329
Author(s):  
Kathrin Wehming ◽  
Moritz Schubert ◽  
Gregor Schnakenburg ◽  
Siegfried R. Waldvogel
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reaction

scholarly journals Synthesis of triphenylpyridines via an oxidative cyclization reaction using Sr-doped LaCoO3 perovskite as a recyclable heterogeneous catalyst

RSC Advances ◽  
2019 ◽  
Vol 9 (41) ◽  
pp. 23876-23887 ◽  
Author(s):  
Thu N. M. Le ◽  
Son H. Doan ◽  
Phuc H. Pham ◽  
Khang H. Trinh ◽  
Tien V. Huynh ◽  
...  
Keyword(s):  
Heterogeneous Catalyst ◽  
Oxidative Cyclization ◽  
Cyclization Reaction ◽  
Lanthanum Cobaltite ◽  
Recyclable Heterogeneous Catalyst

An La0.6Sr0.4CoO3 strontium-doped lanthanum cobaltite perovskite was prepared via a gelation and calcination approach and used as a heterogeneous catalyst for the synthesis of triphenylpyridines via the cyclization reaction between ketoximes and phenylacetic acids.

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