4-Amino-6-chloro-2-piperazinopyrimidines with selective affinity for .alpha.2-adrenoceptors

4-Amino-6-chloro-2-piperazinopyrimidines with selective affinity for .alpha.2-adrenoceptors 2-Amino-6-chloro-4-(N-methylpiperazino)pyrimidines, inhibitors of spiroperidol binding Pyridinylpiperazines, a new class of selective .alpha.2-adrenoceptor antagonists α₁-Adrenoceptor Antagonists. 6. Structural Optimization of Pyridazinone−Arylpiperazines. Study of the Influence on Affinity and Selectivity of Cyclic Substituents at the Pyridazinone Ring and Alkoxy Groups at the Arylpiperazine Moiety α1-Adrenoceptor antagonists. 5. Pyridazinone-arylpiperazines. Probing the influence on affinity and selectivity of both ortho-Alkoxy groups at the arylpiperazine moiety and cyclic substituents at the pyridazinone nucleus N,N-Disubstituted piperazines: synthesis and affinities at α4β2∗ and α7∗ neuronal nicotinic acetylcholine receptors 2,4-Diamino-6,7-dimethoxyquinazolines. 2. 2-(4-Carbamoylpiperidino) derivatives as .alpha.1-adrenoceptor antagonists and antihypertensive agents New Substituted 1-(2,3-Dihydrobenzo[1,4]dioxin-2-ylmethyl)piperidin-4-yl Derivatives with α₂-Adrenoceptor Antagonist Activity Adrenoceptor and tetrabenazine antagonism activities of some pyridinyltetrahydropyridines 2,4-Diamino-6,7-dimethoxyquinazolines. 4. 2-[4-(Substituted oxyethoxy)piperidino] derivatives as .alpha.1-adrenoceptor antagonists and antihypertensive agents