The Reactions of Electron-Rich Heterocycles with Derivatives of Orthocarboxylic Acids; VIII. Proton Acid-Catalyzed Acylation of Indoles by 2-Alkoxy-1,3-dioxolanes
作者:Eyüp Akgün、Mustafa Tunali、Ulf Pindur
DOI:10.1002/ardp.19873200504
日期:——
In acid‐catalyzed reactions with 3‐unsubstituted indoles 1, 2‐alkoxy‐1,3‐dioxolanes 2a‐c behave as acyl equivalents. Depending on the substitution patterns of the reaction partners, the 1,3‐dioxolanium ions 3a‐c, generated in situ from the cyclic ortho esters by the action of sulfosalicylic acid, react to form tris‐(3‐indolyl)alkanes 6 and 9, bis‐(3‐indolyl)ethenes 7, or 3‐benzoylindoles 8. Analogous
在与 3-未取代吲哚 1 的酸催化反应中,2-烷氧基-1,3-二氧戊环 2a-c 表现为酰基等价物。根据反应伙伴的取代模式,通过磺基水杨酸的作用从环状原酸酯原位生成的 1,3-二氧戊环离子 3a-c 反应形成三-(3-吲哚基)烷烃 6 和 9 , 双- (3- 吲哚基) 乙烯 7, 或 3- 苯甲酰吲哚 8. 与相关的无环原酸酯观察到类似的反应性。