Palladium-Catalyzed Coupling of Naphthoquinone Triflates with Stannanes. Unprecedented Nucleophilic Aromatic Substitution on a Hydroxynaphthoquinone Triflate
General Methodology for the Preparation of Unsymmetrical α-Linked Bisenones via Ligandless Cross-Coupling Reactions
作者:David R. Williams、Seth A. Bawel
DOI:10.1021/acs.orglett.7b00497
日期:2017.4.7
A stereocontrolled Stillecross-coupling reaction, involving the use of Pd2dba3, provides a general procedure for the synthesis of unsymmetrical α-linked bisenone systems. The transformation is achieved in the absence of phosphine ligands under conditions that promote the stabilization of “ligandless” palladium catalysis. The extension of these studies illustrates Suzuki–Miyaura reactions of 2-bor
Palladium-Catalyzed Enantioselective Heck Alkenylation of Acyclic Alkenols Using a Redox-Relay Strategy
作者:Harshkumar H. Patel、Matthew S. Sigman
DOI:10.1021/ja5130836
日期:2015.3.18
carbonyl group in high enantioselectivity. The success of this reaction is attributed to the use of electron-withdrawing alkenyl triflates, which offer selective β-hydride elimination followed by migration of the catalyst through the alkyl chain to give the alkenylated carbonyl products. The synthetic utility of the process is demonstrated by a two-step modification of a reaction product to yield a tricyclic
Palladium-Catalyzed Coupling of Naphthoquinone Triflates with Stannanes. Unprecedented Nucleophilic Aromatic Substitution on a Hydroxynaphthoquinone Triflate
作者:Antonio M. Echavarren、Óscar de Frutos、Nuria Tamayo、Pedro Noheda、Paloma Calle