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The synthesis of lin ‐benzoreumycin, lin ‐benzo‐1‐methylxanthine, and lin ‐benzo‐1,9‐dimethylxanthine

The synthesis of lin ‐benzoreumycin, lin ‐benzo‐1‐methylxanthine, and lin... Commencing with 7‐chloro‐3‐methylquinazoline‐2,4(1H,3H)‐dione (9a), a five step synthesis of 7‐methylpyrimido(5,4‐g)‐1,2,4‐benzotriazine‐6,8(7H,9H)‐dione (lin‐benzoreumycin, 6) has been accomplished. A synthesis of 1,7‐dimethylpyrimido(5,4‐g)‐1,2,4‐benzotriazine‐6,8(1H,7H)‐dione (lin‐benzotoxoflavin, 5) employing an intermediate from the preparation of 6 (i.e., 7‐chloro‐3‐methyl‐6‐nitroquinazoline‐2,4(1H,3H)‐dione, 9b) was attempted but could not be accomplished beyond the dihydro precursor of 5 (i.e., 12). Compound 9b did lead to successful preparations of 7‐methylimidazo(4,5‐g)quinazoline‐6,8(5H,7H)‐dione (lin‐benzo‐1‐methylxanthine, 7) and 3,7‐dimethylimidazo(4,5‐g)quinazoline‐6,8(5H,7H)‐dione (lin‐benzo‐1,9‐dimethylxanthine, 8) by first reacting 9b with ammonia (for 7) or methylamine (for 8) followed by reductive cyclization in formic acid. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Heterocyclic Chemistry Wiley

The synthesis of lin ‐benzoreumycin, lin ‐benzo‐1‐methylxanthine, and lin ‐benzo‐1,9‐dimethylxanthine

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References (25)

Publisher
Wiley
Copyright
Copyright © 1984 Journal of Heterocyclic Chemistry
ISSN
0022-152X
eISSN
1943-5193
DOI
10.1002/jhet.5570210331
Publisher site
See Article on Publisher Site

Abstract

Commencing with 7‐chloro‐3‐methylquinazoline‐2,4(1H,3H)‐dione (9a), a five step synthesis of 7‐methylpyrimido(5,4‐g)‐1,2,4‐benzotriazine‐6,8(7H,9H)‐dione (lin‐benzoreumycin, 6) has been accomplished. A synthesis of 1,7‐dimethylpyrimido(5,4‐g)‐1,2,4‐benzotriazine‐6,8(1H,7H)‐dione (lin‐benzotoxoflavin, 5) employing an intermediate from the preparation of 6 (i.e., 7‐chloro‐3‐methyl‐6‐nitroquinazoline‐2,4(1H,3H)‐dione, 9b) was attempted but could not be accomplished beyond the dihydro precursor of 5 (i.e., 12). Compound 9b did lead to successful preparations of 7‐methylimidazo(4,5‐g)quinazoline‐6,8(5H,7H)‐dione (lin‐benzo‐1‐methylxanthine, 7) and 3,7‐dimethylimidazo(4,5‐g)quinazoline‐6,8(5H,7H)‐dione (lin‐benzo‐1,9‐dimethylxanthine, 8) by first reacting 9b with ammonia (for 7) or methylamine (for 8) followed by reductive cyclization in formic acid.

Journal

Journal of Heterocyclic ChemistryWiley

Published: May 1, 1984

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