Category: catalyst-palladium. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: PD2DBA3, is researched, Molecular C51H42O3Pd2, CAS is 60748-47-2, about Palladium-Catalyzed Cascade C-H Functionalization/Asymmetric Allylation Reaction of Aryl α-Diazoamides and Allenes: Lewis Acid Makes a Difference. Author is Wu, Min-Song; Ruan, Xiao-Yun; Han, Zhi-Yong; Gong, Liu-Zhu.
A Pd-catalyzed cascade C-H functionalization/asym. allylation reaction with aryl α-diazoamides and allenes was developed. The reaction provided an efficient approach to construct chiral 3,3-disubstituted oxindole derivatives I [R = n-heptyl, 2-Me-benzyl, 2-naphthylmethyl; R1 = Me, Et, Bn; R2 = H, 5-Me, 5-Ph, etc.; Ar = Ph, 2-FC6H4, 4-F3CC6H4, etc.] in high levels of yield and enantioselectivity (up to 93 % ee). Notably, the chromium complex worked as Lewis acid to facilitate the formation of palladium carbene and to enhance acidity of carboxylic acid, allowing for higher stereochem. control and efficiency.
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Reference:
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method