The effect of 2-(arylimino)thiazolidines (AITs), arylethanolamines (AEAs), 2-(aralkylamino)-2-thiazolines (AATs), 2-(arylimino)oxazolidines (AIOs), and related compounds was examined on the adenylate cyclase prepared from ventral nerve cords of the American cockroach Periplaneta americana L. No AEAs had a higher Vmax (the maximal response) than OA. However, various AEAs had higher potency than OA. Greater enzyme activation appeared to be favored by alkyl chain of medium length rather than halogen substitutions in the 2,6-positions of the aromatic ring of AITs. Although the difference of substituents at the phenyl of AAT compounds in Vmax was not significant, their potency was of wide difference. AIT and AIO with the 2-Me-4-Cl group had similar Vmax, and AIT with the 2,6-Et2 group had a higher Vmax than its AIO analog. The AIOs had higher potency than the AITs, whereas 3,4-dichlorobenzyl AAT was more active than its oxazoline derivative in both Vmax and potency.
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