Process for the manufacture of 2-amino-aryleno-thiazole compound

Details Process for the manufacture of 2-amino-aryleno-thiazole compound Process for the manufacture of 2-amino-aryleno-thiazole compound

1979-01-23

1981-02-24

Daus, Donald G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548164, C07D27282

Patent

active

042529638

ABSTRACT:
2-Amino-aryleno-thiazoles in which the amino group in 2-position can be substituted by aryl, alkyl and/or cycloalkyl, and 2-imino-aryleno-thiazolines substituted at the ring nitrogen by aryl, alkyl or cycloalkyl are produced by cyclization of arylthioureas carrying corresponding substituents at the respective nitrogen atom, using thionyl chloride as cyclization agent. The advantage of the improved process resides in that the amount of sulfur formed is very low and that the other by-products are easy to separate and can be used further. The thiazoles and thiazolines are obtained in a high yield and purity. They are valuable starting compounds, especially for the manufacture of dyestuffs.

REFERENCES:
Elderfield, Heterocyclic Compounds, vol. 5, Wiley, N.Y., NY, (1957), p. 584.
Finar, Organic Chemistry, vol. 1, Longmans Green, N.Y., (1959), p. 184.

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