direct insertion of alkenes into unstrained ring 2-aryl-1,3-indandiones is reported, which provides a one-carbon ring expansion strategy for the synthesis of 1,4-naphthoquinones. Entirely differing from the existing reports, the alkenes herein behave as C1 units to participate in annulation reactions. This transformation provides a facile route to access a class of highly functionalized 1,4-naphthoquinones
An intermolecular annulation reaction of 2‐aryl‐1,3‐indandions with alkynes was reported using Pd(OAc)2 to access spirobi[indene]‐1,3‐diones. Under palladium catalysis, the substrates form a homocoupling dimer intermediate through a catalytic dehydrogenativecross‐coupling process. The palladium(II) species could come from dimer or 2‐aryl‐1,3‐indandion. Notably, this pathway is not typically observed
据报道,使用 Pd(OAc)2 进行 2-芳基-1,3-茚满二酮与炔烃的分子间成环反应,得到螺二[茚]-1,3-二酮。在钯催化下,底物通过催化脱氢交叉偶联过程形成同偶联二聚体中间体。钯 (II) 物质可能来自二聚体或 2-芳基-1,3-茚满二酮。值得注意的是,这种途径通常在烯醇导向的形式 sp3 C-H 官能化/氧化成环钯化学中观察不到。这种转化提供了获得一类官能化螺环碳环茚的途径。
Harnack, Christian; Krull, Wolfgang; Lehnig, Manfred, Journal of the Chemical Society. Perkin transactions II, 1994, # 6, p. 1247 - 1252
作者:Harnack, Christian、Krull, Wolfgang、Lehnig, Manfred、Neumann, Wilhelm P.、Zarkadis, Antonios K.
DOI:——
日期:——
Cavallini et al., Farmaco, Edizione Scientifica, 1955, vol. 10, p. 710,719