Synthetic Studies on Condensed-Azole Derivatives. II. Application of a Computer-Assisted Automated Synthesis Apparatus for the Synthesis of N-Substituted Sulfamoylpropylthioimidazo(1,2-b)pyridazines.
Synthetic Studies on Condensed-Azole Derivatives. II. Application of a Computer-Assisted Automated Synthesis Apparatus for the Synthesis of N-Substituted Sulfamoylpropylthioimidazo(1,2-b)pyridazines.
Synthetic Studies on Condensed-Azole Derivatives. II. Application of a Computer-Assisted Automated Synthesis Apparatus for the Synthesis of N-Substituted Sulfamoylpropylthioimidazo(1,2-b)pyridazines.
For the purpose of improving the anti-asthmatic activity of 3-(imidazo[1, 2-b]pyridazin-6-yl)thiopropanesulfon-amide (I), the computer-assisted automated synthesis apparatus developed at Takeda was used to modify the sulfon-amide moiety of I. Several kinds of sulfonamide derivatives (1-24) were easily obtained, confirming the usefulness of the automated synthesis apparatus in the laboratory. Anti-asthmatic activity of these derivatives was examined in a platelet activating factor (PAF)-induced bronchoconstriction. Among them, the piperidino-piperidine derivative (13) was found to possess comparable activity to that of I.