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We have taken into consideration a group of 28 imidazo [1,2-a]pyridine derivatives, some of which were already known, whereas the others have been synthesized and characterized to complete the series. Antiinflammatory, analgesic, antipyretic and ulcerogenic activities of such compounds were evaluated in comparison with indomethacin. The pharmacological data demonstrated the effects exerted on activity by the presence on the heterocyclic system of methyl substituents and/or an acidic moiety.

Des acides methyl-2 imidazo [1,2-a] pyrazinecarboxyliques-3 possedant quelques substituants sur le noyau pyrazinique ont ete synthetises par reaction d'une amino-2 pyrazine avec le chloro-2 acetylacetate d'ethyle. L'activite antiinflammatoire, analgesique et antipyretique de ces acides a ete comparee avec celle de l'indometacine

A group of ethyl 2-methylimidazo[1,2-a]pyrimidine-3-carboxylates were prepared by reaction of ethyl 2-chloroacetoacetate with some 2-aminopyrimidines. These ethyl esters were then converted into the corresponding carboxylic acids via alkaline hydrolysis. The acids so obtained were evaluated for antiinflammatory, analgesic, antipyretic and ulcerogenic activities.

The preparation of imidazo [1,2-a] pyrimidin-2-acetic acid by two different synthetic methods is reported. A structure is tentatively proposed for a side product.

A group of methyl substituted imidazo[1,2-a]pyridine-3-acetic acids was synthesized by reaction of some methyl derivatives of 2-aminopyridine with ethyl 3-bromolevulinate and subsequent hydrolysis. These new acidic compounds were tested for their antiinflammatory, analgesic, antipyretic and ulcerogenic activities in order to compare the results with those previously obtained with similar compounds.

The synthesis of a series of 6-carbethoxy-, 6-carbethoxy-methyl-, and 5-carbethoxy-6-methylimidazo[2,1-b]-1,3,4-thiadiazoles was accomplished by reacting some 2-amino-1,3,4-thiadiazoles with ethyl bromopyruvate, 4-chloroacetoacetate, and 2-chloroacetoacetate, respectively; such carbethoxy derivatives afforded the corresponding carboxylic acids by hydrolysis. The antiinflammatory, analgesic, antipyretic and ulcerogenic activities were studied on three of the new acidic compounds.

A series of imidazo[1,2-a]pyrimidine-, imidazo[1,2-c]pyrimidine- and imidazo[1,2-b]pyridazinecarboxamides and acetamides were prepared and their antiinflammatory, analgesic, antipyretic and ulcerogenic activities were evaluated.

Since we had previously observed the considerable anti-inflammatory activity of imidazo[1,2-a]pyrazine 2-acetic acid, we prepared a series of imidazo[1,2-a]pyrazine derivatives, bearing some substituents on the pyrazine ring and a carboxylic, acetic or alpha-methylacetic moiety on the imidazole ring. These new compounds were tested for antiinflammatory, analgesic, antipyretic and ulcerogenic activities.