Indication of Pd–C or Cu–C Intermediates in Bimetallic Nanoclusters During Pd/Au-PVP- or Cu/Au-PVP-Catalyzed Oxidations of endo-4-Oxatricyclo[5.2.1.02,6]-8-decene and Tetrahydro-γ-carbolines
作者:Duy H. Hua、Shunya Morita、Zhaoyang Ren、Lingaraju Gorla、Zongbo Tong、Edruce Edouarzin、Boris Averkiev、Victor W. Day
DOI:10.1055/a-2001-6888
日期:2023.4
and 2,3-dihydroxybenzoic acid with Cu/Au-PVP (2–5 mol%) and H2O2 at 25 °C, providing two-bond-forming [4+2] cycloadducts. Under similar reaction conditions, Pd/Au-PVP did not produce the corresponding cycloadduct, indicating a need for complexation between Cu and the carboxylic acid group of 2,3-dihydroxybenzoic acid and the allylic amine function of the γ-carbolines during the cyclization reaction
在 H 2 O 2或t -BuOOH 作为氧化剂存在下,双金属纳米团簇 Cu/Au-PVP催化氧化三环内降冰片烯稠合四氢呋喃,导致与醚官能团相邻的 C-H 键氧化得到 4- oxa-tricyclo[5.2.1.0]-8,9- exo -epoxydecane,然而,Pd/Au-PVP 的氧化发生在 C=C 双键处,得到相同的环氧化物和氧化三键形成的二聚产物, dodecahydro-1,4:6,9-dimethanodibenzofurano[2,3- b :7,8- b']双氧戊环。后一种产物的形成表明反应性 Pd-C 中间体的参与。类似地,在 N2 - Boc-1,2,3,4-四氢-γ-咔啉和 2,3-二羟基苯甲酸与 Cu/Au-PVP (2– 5 mol%) 和 H 2 O 2在 25 °C 下,提供形成双键的 [4+2] 环加合物。在类似的反应条件下,Pd/Au-PVP 没有产生