DERIVATIVES OF 6-CYCLOAMINO-2-THIENYL-3-(PYRIDIN-4-YL)IMIDAZO[1,2-b]-PYRIDAZINE AND 6-CYCLOAMINO-2-FURANYL-3-(PYRIDIN-4-YL)IMIDAZO[1,2-b]-PYRIDAZINE, PREPARATION AND THERAPEUTIC USE THEREOF
The invention relates to derivatives of 6-cycloamino-2-thienyl-3-(pyridin-4-yl)imidazo[1,2-b]-pyridazine and 6-cycloamino-2-furanyl-3-(pyridin-4-yl)imidazo[1,2-b]-pyridazine with general formula (I). The invention also relates to a method for the preparation and therapeutic application thereof, in the treatment or prevention of illnesses involving casein kinase 1 epsilon and/or casein kinase 1 delta.
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Paragraph 0203; 0204
(2013/07/31)
Reactivity of 2-substituted imidazo[1,2-b]pyridazines: Preparation of 3-nitro, nitroso and chloro derivatives
The synthesis of 2-substitutedimidazo[1,2-b]pyridazines and their reactivity towards electrophilic substitutions are reported. The nitration was shown to be very dependent on the nature of the 2 substituent. Nitrosation using sodium nitrite in acetic acid media as a general method failed in all cases whereas chlorination was observed in warm hydrochloric acid. In order to ascertain the structure of some chloro derivatives, chlorination using N-chlorosuccinimide was also reported. Depending of the nature of the substituent, the reaction occurred at the C-3 imidazolic position and/or at the substituent on position 2. The 3-nitroso-2-phenyl derivative was finally obtained using an alternative synthetic pathway by direct condensation of 3-amino-6-chloropyridazine to ω-chloro-ω-nitrosoacetophenone. The structural determinations were ascertained using high field 1H and 13C-NMR.