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Synthesis of regioisomeric 6,9‐(chlorofluoro)‐substituted benzo[ g ]quinoline‐5,10‐diones, benzo[ g ] isoquinoline‐5,10‐diones and 6‐chloro‐9‐fluorobenzo[ g ]quinoxaline‐5,10‐dione
Author(s) -
Krapcho A. Paul,
Gallagher Cynthia E.,
Hammach Abdelhakim,
Ellis Michael,
Menta Ernesto,
Oliva Ambrogio
Publication year - 1997
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570340105
Subject(s) - chemistry , isoquinoline , quinoxaline , quinoline , yield (engineering) , catalysis , furan , hydrolysis , zinc , sulfuric acid , organic chemistry , medicinal chemistry , metallurgy , materials science
Treatment of difluoro or chloro fluoro‐substituted benzyl bromides 5a‐c with zinc dust in tetrahydro‐furan leads to the corresponding benzylic zinc bromides 6a‐c. These organometallics on treatment with chlorosubstituted heterocyclic esters 4A and 4B mediated by nickel catalysis undergo couplings to yield dihalobenzyl substituted heterocyclic esters 7Aa‐c and 7Ba‐c. Treatment of 4c with 6c under Pd catalysis leads to 7Cc. The acids 8, prepared by hydrolysis of these esters, with treatment of fuming sulfuric acid undergo cyclizations and oxidations to yield the desired regioisomeric dihalo‐substituted heterocyclic quinones 2.