5-position of the heterocycle. The resulting hetaryl analogues of α-benzoins quantitatively isomerize to β-compounds, the (dimethylhydrazono)methyl group activating the hetaryl residue and thus affording faster isomerization than in their unfunctionalized counterparts. The (dimethylhydrazono)methyl group is easily convertible into the aldehyde or nitrile group and can also be involved in rehydrazonation
苯基
乙二醛水合物与
糠醛和
吡咯-2-甲醛的 N,N-二甲基腙之间的反应在杂环的 5-位进行区域选择性。所得α-
安息香的杂芳基类似物定量异构化为β-化合物,(二甲基
肼基)甲基激活杂芳基残基,因此比未官能化的对应物提供更快的异构化。(二甲基
肼基)甲基很容易转化为醛基或腈基,也可以参与再氢化。(© Wiley-
VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)