期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 132, 期 49, 页码 17471-17482出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja108106h
关键词
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资金
- National Institutes of Health (NIGMS) [RO1 GM3540]
- Dreyfus Foundation
- Pfizer
- Queen's University
The mechanism of an enantioselective palladium-catalyzed alkene difunctionalization reaction has been investigated. Kinetic analysis provides evidence of turnover-limiting attack of a proposed quinone methide intermediate with MeOH and suggests that copper is involved in productive product formation, not just catalyst turnover. Through examination of substrate electronic effects, a Jaffe relationship was observed correlating rate to electronic perturbation at two positions of the substrate. Ligand effects were evaluated to provide evidence of rapid ligand exchange between palladium and copper as well as a correlation between ligand electronic nature and enantioselectivity.
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