Mechanism of pyrazoline formation from the reactions of substituted hydrazines and Mannich bases
作者:F. L. Scott、S. A. Houlihan、D. F. Fenton
DOI:10.1039/j39710000080
日期:——
amidinohydrazone dinitrates. These substituted hydrazones do not display hydrazine anchimerism to form pyrazolines, probably because they exist in the wrong geometric form. The suggested mechanism for pyrazoline formation involves elimination from the Mannich base to form a vinyl ketone, which then forms a hydrazone (of the right configuration); subsequently this cyclises to the pyrazoline.
与曼尼希碱氨基胍硝酸盐反应,ARCO·CH 2 ·CH 2 ·NME 2形成,这取决于pH值,二β酮基肼,1-脒基Δ 2个-pyrazolines,或amidinohydrazone dinitrates。这些取代的不显示肼嵌合现象而形成吡唑啉,可能是因为它们以错误的几何形式存在。建议的吡唑啉形成机理涉及从曼尼希碱中消除形成乙烯基酮,然后形成vinyl(构型正确)。随后,该环化成吡唑啉。