Tempering the Reactivities of Postulated α-Oxo Gold Carbenes Using Bidentate Ligands: Implication of Tricoordinated Gold Intermediates and the Development of an Expedient Bimolecular Assembly of 2,4-Disubstituted Oxazoles
作者:Yingdong Luo、Kegong Ji、Yuxue Li、Liming Zhang
DOI:10.1021/ja307948m
日期:2012.10.24
2,4-Oxazole is an important structural motif in various natural products. An efficient modular synthesis of this structure has been achieved via a [3 + 2] annulation between a terminal alkyne and a carboxamide using a gold-catalyzedoxidation strategy. The postulated reactive intermediate, a terminal α-oxo gold carbene, previously known to be highly electrophilic and hence unlikely to be trapped by
Recent Developments in the Chemistry of Heteroaromatic N-Oxides
作者:Liming Zhang、Youliang Wang
DOI:10.1055/s-0034-1379884
日期:——
ortho-Alkyl C–H Functionalization 4.3.3 N-Oxide Directed Remote C–H Functionalization 4.4 1,3-Dipolar Cycloaddition 5 Conclusion and Outlook Selected developments in the chemistry of heteroaromatic N-oxides since 2001 are presented in this review. The use of these N-oxides, both in late-transition-metal-catalyzed oxidations of carbon–carbon triple bonds and in regioselective C–H functionalizations of the heteroarene