A hydroxyl group was readily and directly introduced into the α-position of a variety of β-dicarbonyl compounds by heterogeneous Pd/C-catalyzed oxygenation using molecular oxygen.
A chemo- and regioselective α-hydroxylationreaction of carbonyl compounds with molecularoxygen as oxidant is reported. The hydroxylation reaction is catalyzed by a dinuclear Pd(II) complex, which functions as an oxygen transfer catalyst, reminiscent of an oxygenase. The development of this oxidation reaction was inspired by discovery and mechanism evaluation of previously unknown Pd(III)-Pd(III)
allowing selective access to tertiary alkylated ketones and alkenes. The present approach features commercially available starting materials, broad substrate scope, general functional-group (including halogen, ester, nitrile, thioether) tolerance. Furthermore, we proposed plausible pathways to rationalize the divergent selectivity through preliminary mechanism study.
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。