Pyrimido[2,1-b]benzothiazoles having antiallergic activity

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...

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5142332, 544115, 544135, 544250, 548162, 560 20, 560 43, 562433, 562434, 558388, A61K 31505, C07D51304

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active

047628405

ABSTRACT:
Novel pyrimido[2,1-b]benzothiazoles of the formula ##STR1## wherein R and R.sub.3 are individually selected from the group consisting of hydrogen and alkyl of 1 to 6 carbon atoms or taken together with the carbon to which they are attached form a cycloalkyl of 3 to 6 carbon atoms, R.sub.1 is selected from the group consisting of hydroxy, alkoxy of 1 to 12 carbon atoms, cycloalkyl of 7 to 12 carbon atoms, and ##STR2## R.sub.5 and R.sub.6 are individually selected from the group consisting of hydrogen and alkyl of 1 to 6 carbon atoms or taken together with the nitrogen form piperidino or morpholino, R.sub.2 is selected from the group consisting of hydrogen, alkyl of 1 to 6 carbon atoms, alkoxycarbonyl of 2 to 7 carbon atoms, cycloalkyl of 3 to 6 carbon atoms, heteroaryl, aralkyl and optionally substituted aryl with at least one substituent selected from the group consisting of halogen, nitro, and alkyl and alkoxy of 1 to 6 carbon atoms and their salts with non-toxic, pharmaceutically acceptable acids and bases having antiallergic activity.

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Antaki, et al., Chemical Abstracts, vol. 45, 9061e (1951).
Alaimo, J. Heterocyclic Chem., vol. 10, No. 5, pp. 769-772 (1973).

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