Divergent Reaction Pathways of a Cationic Intermediate: Rearrangement and Cyclization of 2-Substituted Furyl and Benzofuryl Enones Catalyzed by Iridium(III)
作者:Tulaza Vaidya、Gerald F. Manbeck、Sylvia Chen、Alison J. Frontier、Richard Eisenberg
DOI:10.1021/ja111317q
日期:2011.3.16
exhibit unusual rearrangement sequences in the presence of catalytic amounts of [IrBr(CO)(DIM)((R)-(+)-BINAP)](SbF(6))(2) (1; DIM = diethylisopropylidene malonate) and AgSbF(6) (1:1). A 1,2-H shift followed by intramolecular Friedel-Crafts alkylation leads to synthetically valuable cyclohexanones with furanylic quaternary centers. The electrophilicity of 1 is essential for this rearrangement.
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.