Ring Transformations of Semicyclic 1,3-Dicarbonyl Heteroanalogs; I. Synthesis of SemicyclicN-Acyl- andN-(Aminocarbonyl)amidine Derivatives and Their Ring Transformation to 5-(ω-Aminoalkyl)-1,2,4-triazoles
Ring-chain-transfer reactions. Part VII. Application of the ring-chain-transfer concept to the synthesis of 4-(.omega.-aminoalkyl)imidazole analogs of histamine