O,ω‐Unsaturated N‐tosyl alkoxyamines undergo unexpected RhIII‐catalyzed intramolecular cyclization by oxyamination to produce oxygen‐containing heterocycles. Mechanistic studies show that an aziridine intermediate seems to be responsible for the formation of the heterocycles, possibly via a RhV species.
One-Pot Regio- and Stereoselective Cyclization of 1,2,<i>n</i>-Triols
作者:Tao Zheng、Radha S. Narayan、Jennifer M. Schomaker、Babak Borhan
DOI:10.1021/ja043002i
日期:2005.5.1
A simple and efficient process to cyclize triols containing a 1,2-diol functionality with a pendant hydroxyl group is presented. The one-pot procedure converts the 1,2-diol into an ortho ester in situ, which upon treatment with a Lewis acid generates a cyclic acetoxonium intermediate. This intermediate is subsequently trapped by the pendant hydroxyl group to generate a cyclic ether. The stereochemistry
Multi-Metal-Catalyzed Oxidative Radical Alkynylation with Terminal Alkynes: A New Strategy for C(sp<sup>3</sup>)–C(sp) Bond Formation
作者:Shan Tang、Yichang Liu、Xinlong Gao、Pan Wang、Pengfei Huang、Aiwen Lei
DOI:10.1021/jacs.8b02745
日期:2018.5.9
for C(sp3)-C(sp) cross-coupling with terminalalkynes has been developed by using a multi-metal-catalyzed reaction strategy. Alkyl radicals generated from different approaches are able to couple with terminalalkynes by judicious selection of the catalyst combination. This reaction protocol offers an efficient alternative approach for the synthesis of substituted alkynes from terminalalkynes besides
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...
BCl3 as the sole boron source, the boryl group and thiol group are added to the C-C double bonds simultaneously. After hydrolysis, the corresponding ((tetrahydrothiophen-2-yl)methyl)boronic acid, ((tetrahydro-2H-thiopyran-2-yl)methyl)boronic acid, ((2,3-dihydrobenzo[b]thiophen-2-yl)methyl)boronic acid and (thiomorpholin-2-ylmethyl)boronic acid are obtained with good yield. The boronic acids obtained