Synthesis of Benzazoles through Electrochemical Oxidative Cyclization Reactions

2020 ◽  
Vol 7 (19) ◽  
pp. 3969-3974
Author(s):  
Qi An ◽  
Chaoyin He ◽  
Xiaodong Fan ◽  
Chuanfu Hou ◽  
Jian Zhao ◽  
...  
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reactions

scholarly journals Pt(II)-Decorated Covalent Organic Framework for Photocatalytic Difluoroalkylation and Oxidative Cyclization Reactions

2021 ◽  
Vol 13 (5) ◽  
pp. 6349-6358
Author(s):  
Zainab Almansaf ◽  
Jiyun Hu ◽  
Federica Zanca ◽  
Hamid R. Shahsavari ◽  
Benjamin Kampmeyer ◽  
...  
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reactions ◽  
Covalent Organic Framework ◽  
Organic Framework

scholarly journals Oxidative cyclo-rearrangement of helicenes into chiral nanographenes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chengshuo Shen ◽  
Guoli Zhang ◽  
Yongle Ding ◽  
Na Yang ◽  
Fuwei Gan ◽  
...  
Keyword(s):  
Functional Materials ◽  
Optical Devices ◽  
Oxidative Cyclization ◽  
Synthetic Chemistry ◽  
Aromatic Rings ◽  
Cyclization Reactions ◽  
Rearrangement Reaction ◽  
Skeletal Reconstruction ◽  
Gradual Release

AbstractNanographenes are emerging as a distinctive class of functional materials for electronic and optical devices. It is of remarkable significance to enrich the precise synthetic chemistry for these molecules. Herein, we develop a facile strategy to recompose helicenes into chiral nanographenes through a unique oxidative cyclo-rearrangement reaction. Helicenes with 7~9 ortho-fused aromatic rings are firstly oxidized and cyclized, and subsequently rearranged into nanographenes with an unsymmetrical helicoid shape through sequential 1,2-migrations. Such skeletal reconstruction is virtually driven by the gradual release of the strain of the highly distorted helicene skeleton. Importantly, the chirality of the helicene precursor can be integrally inherited by the resulting nanographene. Thus, a series of chiral nanographenes are prepared from a variety of carbohelicenes and heterohelicenes. Moreover, such cyclo-rearrangement reaction can be sequentially or simultaneously associated with conventional oxidative cyclization reactions to ulteriorly enrich the geometry diversity of nanographenes, aiming at innovative properties.

ChemInform Abstract: Preparation of Dibenzo[e,g]isoindol-1-ones via Scholl-Type Oxidative Cyclization Reactions.

ChemInform ◽  
2015 ◽  
Vol 46 (10) ◽  
pp. no-no
Author(s):  
Amy A. van Loon ◽  
Maeve K. Holton ◽  
Catherine R. Downey ◽  
Taryn M. White ◽  
Carly E. Rolph ◽  
...  
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reactions

Oxidative Cyclization Reactions:  Amide Trapping Groups and the Synthesis of Furanones

2005 ◽  
Vol 7 (16) ◽  
pp. 3553-3556 ◽  
Author(s):  
John D. Brandt ◽  
Kevin D. Moeller
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reactions

ChemInform Abstract: Diastereoselective Fe(III) Mediated Oxidative Cyclization Reactions of Cyclopropanone Acetals.

ChemInform ◽  
2010 ◽  
Vol 29 (35) ◽  
pp. no-no
Author(s):  
K. I. BOOKER-MILBURN ◽  
A. BARKER ◽  
W. BRAILSFORD
Keyword(s):  
Oxidative Cyclization ◽  
Cyclization Reactions

PIFA-Mediated Oxidative Cyclization Reactions of α-Acyl Acrylamides: A Synthetic Route to Substituted Isoxazol-3(2H)-ones

Synthesis ◽  
2018 ◽  
Vol 50 (09) ◽  
pp. 1875-1882 ◽  
Author(s):  
Rui Zhang ◽  
Dewen Dong ◽  
Jingwen Yuan ◽  
Chitturi Rao ◽  
Qian Zhang ◽  
...  
Keyword(s):  
Intramolecular Cyclization ◽  
Oxidative Cyclization ◽  
Metal Catalyst ◽  
Synthetic Route ◽  
Cyclization Reactions ◽  
Reaction Conditions ◽  
Catalyst Free ◽  
Free Oxidation

An intramolecular cyclization of various α-acyl β-amino acrylamides in the presence of PIFA and TFA is described. This transformation features mild reaction conditions, simple execution, high chemo­selectivity, and metal catalyst-free oxidation, and thereby, provides not only an alternative protocol for the construction of N–O bond, but also an efficient and straightforward synthesis of substituted isoxazol-3(2H)-ones from readily available α-acyl acrylamides.

Synthesis of Some 1H-1,2,4-Triazole, 4H-1,2,4-Triazole, Thiazolo[2,3-c]-1,2,4-triazole and 5H-1,2,4-Triazolo-[3,4-b][1,3]thiazine Derivatives by Metal Compound-Mediated Oxidative Cyclization of Derivatives of 2-(Phenylmethylidene)hydrazinecarboximidothioic Acid

1997 ◽  
Vol 50 (9) ◽  
pp. 911 ◽  
Author(s):  
Abdelselam S. Ali ◽  
John S. Wilkie ◽  
Kevin N. Winzenberg
Keyword(s):  
Oxidative Cyclization ◽  
Lead Tetraacetate ◽  
Metal Compound ◽  
Cyclization Reactions ◽  
Triazole Derivatives ◽  
Derivatives Of

Reaction of the methyl 2-(phenylmethylidene)hydrazinecarboximidothioate derivatives (3a–d) and (6a,b) with iron(III) chloride afforded the 5-methylsulfanyl-3-phenyl-4H-1,2,4-triazole derivatives (4a–d) and the 5-methylsulfanyl-3-phenyl-1H-1,2,4-triazole derivatives (7a,b). This reaction was extended to the synthesis of the 3-phenyl-5,6-dihydrothiazolo[2,3-c]-1,2,4-triazole derivatives (10a,b) and the 3-phenyl-6,7-dihydro-5H-1,2,4-triazolo[3,4-b][1,3]thiazine derivatives (10c,d). Reaction of 5-(3-chlorophenyl)-2,4-dihydro-3H-1,2,4-triazole-3-thione (12a) with 1,2-dibromoethane gave (10a) together with the isomeric 2-(3-chlorophenyl)-5,6-dihydrothiazolo[3,2-b][1,2,4]triazole (13a); similarly, reaction of (12a) with 1,3-dibromopropane afforded (10c) along with 2-(3-chlorophenyl)-6,7-dihydro-5H-[1,2,4]triazolo[5,1-b][1,3]thiazine (13b). The use of nickel peroxide and lead tetraacetate in place of iron(III) chloride was investigated for some of these oxidative cyclization reactions.

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