Mechanistic examination of Au<sup>III</sup>-mediated 1,5-enyne cycloisomerization by AuBr<sub>2</sub>(<i>N</i>-imidate)(NHC)/AgX precatalysts – is the active catalyst Au<sup>III</sup> or Au<sup>I</sup>?
作者:Jonathan P. Reeds、Mark P. Healy、Ian J. S. Fairlamb
DOI:10.1039/c4cy00617h
日期:——
The role of AuI and AuIII species in 1,5-enyne cycloisomerization reactions has been examined in this paper.
本文研究了AuI和AuIII物种在1,5-炔烯环异构化反应中的作用。
Calcium-Catalyzed Direct Coupling of Alcohols with Organosilanes
作者:Vera J. Meyer、Meike Niggemann
DOI:10.1002/ejoc.201100231
日期:2011.7
A calcium-catalyzeddirect substitution of π-activatedalcohols with different organosilanes under very mild reaction conditions is presented. The high reactivity of the calcium catalyst allows efficient conversion of secondary and tertiary allylic, secondary benzylic, and tertiary propargylic alcohols with allyltrimethylsilane at room temperature. Furthermore, the first direct substitution of an alcohol
Synthesis of Bridged Azacycles and Propellanes via Nitrene/Alkyne Cascades
作者:Qinxuan Wang、Jeremy A. May
DOI:10.1021/acs.orglett.0c00798
日期:2020.4.17
nitrene tether showed that 7-membered rings were the maximum ring size to be formed by nitrene attack on the alkyne. Examples incorporating stereocenters on the carbonazidate’s tether induced diasteroselectivity in the formation of the bridgedring and two new stereocenters. Additionally, propellanes containing aminals, hemiaminals, and thioaminals formed from the bridged azacycles in the same reaction via
Gold(<scp>i</scp>)-catalyzed dehydrogenative cycloisomerization of 1,5-enynes
作者:Gen-Qiang Chen、Wei Fang、Yin Wei、Xiang-Ying Tang、Min Shi
DOI:10.1039/c6cc05423d
日期:——
Gold(I)-catalyzed dehydrogenative cycloisomeriaztion of cyclopropane tethered 1,5-enynes proceeded smoothly to give multisubstituted benzene derivatives in good to excellent yields. Synthetically important benzocyclobutenes can be produced in high yields in the...