On the problem of the cyclisation of benzothiazolyl-anthranilic acids into thiazolo-acridinones. The case of thiazolo[4,5-a]acridines
摘要:
The cyclization of benzothiazolyl-anthranilic acids always yields 'bent' tetracycles. This has been verified in the case of benzothiazol-5-yl derivatives where, contrary to a recent literature report, the only products found are thiazolo[4,5-a]acridine derivatives.