Tröger's-base analogues bearing fused pyrazolic or pyrimidinic rings were prepared in acceptable to good yields through the reaction of 3-alkyl-5-amino-1-arylpyrazoles and 6-aminopyrimidin-4(3H)-ones with formaldehyde under mild conditions (i.e., in ethanol at 50 °C in the presence of catalytic amounts of acetic acid). Two key intermediates were isolated from the reaction mixtures, which helped us to suggest a sequence of steps for the formation of the Tröger's bases obtained. The structures of the products were assigned by 1H and 13C NMR, mass spectra and elemental analysis and confirmed by X-ray diffraction for one of the obtained compounds.
通过 3-烷基-5-
氨基-1-芳基
吡唑和 6-
氨基嘧啶-4(3H)-酮与
甲醛在温和条件下(即在
乙醇中,50 °C,有催化量的
乙酸存在)的反应,制备了带有融合
吡唑或
嘧啶环的特罗格氏碱类似物,收率可接受至良好。从反应混合物中分离出了两个关键的中间产物,这有助于我们提出特罗格氏碱形成的步骤顺序。通过 1H 和 13C NMR、质谱和元素分析确定了产物的结构,并通过 X 射线衍射确认了其中一种化合物。