A PHP Error was encountered

Severity: Warning

Message: file_get_contents(https://...@gmail.com&api_key=61f08fa0b96a73de8c900d749fcb997acc09): Failed to open stream: HTTP request failed! HTTP/1.1 429 Too Many Requests

Filename: helpers/my_audit_helper.php

Line Number: 143

Backtrace:

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 143
Function: file_get_contents

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 209
Function: simplexml_load_file_from_url

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 994
Function: getPubMedXML

File: /var/www/html/application/helpers/my_audit_helper.php
Line: 3134
Function: GetPubMedArticleOutput_2016

File: /var/www/html/application/controllers/Detail.php
Line: 574
Function: pubMedSearch_Global

File: /var/www/html/application/controllers/Detail.php
Line: 488
Function: pubMedGetRelatedKeyword

File: /var/www/html/index.php
Line: 316
Function: require_once

Expeditious synthesis of CF-phenanthridones through a base-mediated cross-conjugated vinylogous benzannulation (VBA). | LitMetric

AI Article Synopsis

  • Researchers have developed a quick and efficient method to create CF-phenanthridones using 4-methyl-3-trifluoroacetylquinolones and nitro-olefins through a special chemical reaction called benzannulation.
  • This new method is better than previous ones because it only requires a basic substance and doesn't depend on complicated metal catalysts or oxidants.
  • The presence of the strong electron-withdrawing CF group in the quinolone helps to form a reactive intermediate that drives the reaction forward.

Article Abstract

Herein, we report a mild, efficient, and rapid approach for the preparation of CF-phenanthridones through a cross-conjugated vinylogous [4 + 2] benzannulation of easily accessible 4-methyl-3-trifluoroacetylquinolones and nitro-olefins. The present transformation is superior to previous approaches for obtaining CF-phenanthridones, in that it proceeds exclusively with the assistance of a simple base, eliminating the need for transition metal catalysts or oxidants. The strong electron-withdrawing nature of the CF-group present in the quinolone moiety promotes the formation of a reactive cross-conjugated vinylogous enolate.

Download full-text PDF

Source
http://dx.doi.org/10.1039/d4ob01480dDOI Listing

Publication Analysis

Top Keywords

cross-conjugated vinylogous
12
vinylogous benzannulation
8
expeditious synthesis
4
synthesis cf-phenanthridones
4
cf-phenanthridones base-mediated
4
base-mediated cross-conjugated
4
benzannulation vba
4
vba report
4
report mild
4
mild efficient
4

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!

A PHP Error was encountered

Severity: Notice

Message: fwrite(): Write of 34 bytes failed with errno=28 No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 272

Backtrace:

A PHP Error was encountered

Severity: Warning

Message: session_write_close(): Failed to write session data using user defined save handler. (session.save_path: /var/lib/php/sessions)

Filename: Unknown

Line Number: 0

Backtrace: