The synthesis of the 2-oxides of thiazolo[3,2-a]pyrazinum salts (IV) and their deoxygenation to the title compounds (V) is described. An alternative route to the title compounds by intramolecular cyclisation of the anils formed between 2-acylthiazoles and aminoacetaldehyde dimethylacetal is also described.
J. Adamson, E. C. Campbell and E. E. Glover, J. Chem. Soc. C, 1969, 2270 DOI: 10.1039/J39690002270
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