herein a viable binary acid strategy for the catalytic Nazarov reaction of aryl vinyl ketones. Simply combining a Lewis acid and a Brønsted acid led to a dramatic enhancement of the catalytic activity in the Nazarov reaction of aryl vinyl β-ketoesters. The obtained optimal binary acid catalyst In(OTf)3/diphenyl phosphoric acid (DPP) can be applied to a range of aryl vinyl ketones with good activity. A
Cationic Cyclizations and Rearrangements Promoted by a Heterogeneous Gold Catalyst
作者:Tulaza Vaidya、Ryan Cheng、Peter N. Carlsen、Alison J. Frontier、Richard Eisenberg
DOI:10.1021/ol403542k
日期:2014.2.7
catalyst with remarkable activity for promoting the electrophilic reactions of aryl vinyl ketones and aryl dienyl ketones is described. The catalyst is easy to prepare, is robust, and can be recycled. Low loadings are effective for different types of cationic reactions, including Nazarov cyclizations, lactonizations, and [1,2] shifts.