Amines such as 1,2,3,4-tetrahydroisoquinoline undergo redox-neutral annulations with 2-(2-oxoethyl)malonates in the presence of catalytic amounts of benzoic acid. These reactions install a fully saturated five-membered ring and provide access to structures closely related to the natural products crispine A and harmicine.
胺(例如 1,2,3,4-
四氢异喹啉)在催化量的
苯甲酸存在下与 2-(2-氧代乙基)
丙二酸酯发生氧化还原中性环化。这些反应安装了完全饱和的五元环,并提供了与
天然产物 Crispine A 和 Harmicine 密切相关的结构。