Construction of Spirofused Tricyclic Frameworks by NHC-Catalyzed Intramolecular Stetter Reaction of a Benzaldehyde Tether with a Cyclic Enone
作者:Day-Shin Hsu、Chiao-Yun Cheng
DOI:10.1021/acs.joc.9b01403
日期:2019.9.6
hydrogenation. These substrates were then exposed to an N-heterocyclic carbene, whereupon intramolecular Stetter reaction proceeded smoothly to give various spirofused tricyclic 1,4-diketones in 30–87% yields. Furaldehyde and nicotinaldehyde derivatives also participated in the reaction under the Stetter conditions.
由市售的2-羟基苯甲醛通过三步法,包括三氟甲磺酸盐的形成,Sonogashira交叉偶联和区域选择性氢化来制备具有环烯酮的各种苯甲醛系链。然后将这些底物暴露于N-杂环卡宾,随后分子内Stetter反应顺利进行,以30-87%的收率得到各种螺旋稠合的三环1,4-二酮。在Stetter条件下,呋喃醛和烟醛衍生物也参与了该反应。