Pharmacologically active 4-oxo-4H-chromen-2-carboxylic acids (2-carboxychromones). Part I. The synthesis of 4-oxo-4H-chromen-2-carboxylic acids containing a fused thiazole ring
作者:A. O. Fitton、B. T. Hatton、M. P. Ward、R. Lewis
DOI:10.1039/j39700001553
日期:——
The synthesis of five 2-carboxychromones containing a fused 2-methylthiazole ring is described. All were obtained from appropriately substituted acetylhydroxybenzothiazoles which were synthesised by several routes but mainly by acetylation of methoxybenzothiazoles under various conditions. A note on the mass spectral fragmentation of the 2-methylthiazolochromone acids is included.