Synthesis of 5-amino-4-(2-azacycloalkylidene)-2-phenyl-2,4-dihydro-3H-pyrazol-3-on es.

[摘要]：methylthioalkylidene iminium salts) was investigated. It occurs on the active CH2 group of I to furnish cyclic enamines, 4-(2-azacycloalkylidene)- and 4-(1-methyl-2-azacycloalkylidene)-5-amino-2-phenyl-2,4-dihydro-3H-pyr azol-3-ones.

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