Intermolecular and Selective Synthesis of 2,4,5-Trisubstituted Oxazoles by a Gold-Catalyzed Formal [3+2] Cycloaddition
作者:Paul W. Davies、Alex Cremonesi、Lidia Dumitrescu
DOI:10.1002/anie.201103563
日期:2011.9.12
Oxazole new world: A gold‐catalyzed intermolecular reaction of pyridine‐N‐aminides with ynamides can be used to prepare trisubstituted 1,3‐oxazoles with a variety of functional groups. This formal [3+2] cycloaddition employs robust conjugated N‐ylides as N‐nucleophilic N‐acyl nitrene equivalents for a highly chemoselective and regioselective addition across electron‐rich CC triple bonds.
Site-specific introduction of gold-carbenoids by intermolecular oxidation of ynamides or ynol ethers
作者:Paul W. Davies、Alex Cremonesi、Nicolas Martin
DOI:10.1039/c0cc02736g
日期:——
Ynamides and ynol ethers undergo intermolecular gold-catalysed reaction with a nucleophilic oxidant to access metal-carbenoid reactivity patterns. A site-specific oxidation/1,2-insertion cascade is used for a general access to functionalised α,β-unsaturated carboxylic acid derivatives and vinylogous carbimates.