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2005
Imidazole derivatives
R 0190
A Domino Type One-Flask Synthesis of 1-Substituted-5-aminoimidazoleand Ring Transformation to Pyrazine under Microwave
34- 163 -4-carboxamides
Through Suitable Aminoimidazoliumcarboxamide. — In the case of compounds
(IVe)—(IVg) the corresponding strong basic amines are added at least in the sequence,
to prevent the formation of unwanted oximinate by-products. The multi-component
coupling gives much higher yields than the conventional sequence with an overall yield
of 5—9 percent. Compound (VI) is obtained in quantitative yield, if a multistep method
is used. — (CHATTOPADHYAY*, G.; SAHA, T. K.; Indian J. Chem., Sect. B: Org.
Chem. Incl. Med. Chem. 44 (2005) 4, 827-830; Dep. Chem., Pres. Coll.,
Calcutta 700 073, India; Eng.) — C. Oppel
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