A Highly Efficient Preparative Method of α-Ylidene-β-Diketones via Au<sup>III</sup>-Catalyzed Acyl Migration of Propargylic Esters
作者:Shaozhong Wang、Liming Zhang
DOI:10.1021/ja062777j
日期:2006.7.1
A highlyefficient synthesis of α-alkylidene or benzylidene-β-diketones from readily available propargylic esters has been developed. The proposed key transformation is a novel intramolecular acyl migration to nucleophilic AuIII−C(sp2) bonds. Noteworthy features of this method are its efficiency and stereoselectivity. The yields of this reaction were mostly close to quantitative, and high to excellent
Gold-Catalyzed Efficient Formation ofα,β-Unsaturated Ketones from Propargylic Acetates
作者:Meng Yu、Guotao Li、Shaozhong Wang、Liming Zhang
DOI:10.1002/adsc.200600579
日期:2007.4.2
An efficient gold-catalyzed method for the preparation of α,β-unsaturated ketones from propargylic acetates has been developed. Under mild reaction conditions, β-monosubstituted enones were formed mostly with excellent E-selectivity. β,β-Disubstituted enones can be prepared from propargylic acetates derived from ketones. The high efficiency and mild nature of this reaction render it a viable alternative
Gold-Catalyzed Efficient Preparation of Linear α-Iodoenones from Propargylic Acetates
作者:Meng Yu、Guozhu Zhang、Liming Zhang
DOI:10.1021/ol070637o
日期:2007.5.1
Au(PPh3)NTf2 is needed to convert readily accessible propargylic acetates into versatile linear alpha-iodoenones in good to excellent yields. This reaction is easy to execute and has broad substrate scope. Good to excellent Z-selectivities are observed in the cases of aliphatic propargylic acetates derived from aldehydes.
Gold-catalyzed efficient preparation of linear α-haloenones from propargylic acetates
作者:Meng Yu、Guozhu Zhang、Liming Zhang
DOI:10.1016/j.tet.2008.11.107
日期:2009.2
Versatile linear α-iodo- and α-bromoenones are prepared efficiently from readily accessible propargylic acetates using 2 mol % of Au(PPh3)NTf2. This reaction is easy to execute and has broad substrate scope. Good to excellent Z-selectivities are observed in the cases of propargylic acetates derived from aliphatic aldehydes.
Diastereoselective Synthesis of Eight-Membered-Ring Allenes from Propargylic Epoxides and Aldehydes by Silylene Insertion into Carbon-Oxygen Bonds
作者:Christina Z. Rotsides、Chunhua Hu、K. A. Woerpel
DOI:10.1002/anie.201306093
日期:2013.12.2
Bent out of shape: Silver‐catalyzed insertions of silylenes into propargylic CO bonds of epoxides regioselectively form 1,2‐silaoxetanes, which add to aldehydes to give the title allenes as single diastereomers (see scheme; Ts=4‐toluenesulfonyl). An X‐ray crystal structure confirmed the stereochemistry of the allene, which is bent significantly from linearity (164°).