Fluorine-Enabled Cationic Gold Catalysis: Functionalized Hydration of Alkynes
作者:Weibo Wang、Jacek Jasinski、Gerald B. Hammond、Bo Xu
DOI:10.1002/anie.201003593
日期:——
Fluorine makes it possible: A cationic fluorine–gold species generated by fluorination of a low‐valence gold complex mediates the “functionalized hydration” of alkynes. A triple bond is used to install a carbonyl group and two new bonds on the α‐carbon atom, all occurring in one pot, under mild conditions and in very good yields (see scheme).
Efficient Synthesis of γ-Keto Esters through Neighboring Carbonyl Group-Assisted Regioselective Hydration of 3-Alkynoates
作者:Weibo Wang、Bo Xu、Gerald B. Hammond
DOI:10.1021/jo802450n
日期:2009.2.20
The Au(III)-catalyzed hydration of 3-alkynoates led to a practical one-step synthesis of gamma-keto esters in high yields, through a carbonyl group participation enabled by a favored 5-endodig cyclization. This mild-aqueous ethanol, room temperature, and atom-economical method has been used effectively with a wide range of substrates. Using the same conditions, a 2-alkynoate produced the corresponding beta-keto ester in high yield.
Synthetic evolutions in the nucleophilic addition to alkynes
作者:Bo Xu、Weibo Wang、Le-Ping Liu、Junbin Han、Zhuang Jin、Gerald B. Hammond
DOI:10.1016/j.jorganchem.2010.09.025
日期:2011.1
fluorine-engendered cationic gold catalysis. In addition, we have conducted the synthesis of O-heterocycles through a gold-catalyzed tandem addition/cycloisomerization sequence, the synthesis of N-heterocycles through a copper-catalyzed cyclization-triggered addition of alkynes, and a green synthesis of thioethers ‘on water’ without catalyst or initiator. These nucleophilic synthetic evolutions, catapulted by a simple