In this work, an efficient palladiumcatalyzed annulation of 2-iodobiphenyl with a non-terminal alkene was developed. The key factor in this transformation was the formation of a highly reactive oxo-palladacycle intermediate, which was enabled by a neighboring hydroxyl group, and remarkably restrained the β-H elimination process. Mechanistically, control experiments demonstrated that the hydroxyl group
The design and development of a truly nano heterogeneous catalyst for the Claisen-Schmidt condensation (CSC) of benz-aldehydes with 2-hydroxyacetophenone to yield substituted chalcones followed by isomerization to afford flavanones with excellent yields and selectivity is described. (C) 2005 Elsevier Ltd. All rights reserved.
30. Synthesis of 7-halogenoflavone and related compounds
作者:F. C. Chen、C. T. Chang
DOI:10.1039/jr9580000146
日期:——
Pd-Catalyzed Hydroxyl-Directed Cascade Hydroarylation/C–H Germylation of Nonterminal Alkenes and Aryl Iodides