Alkene‐Directed
<i>N</i>
‐Attack Chemoselectivity in the Gold‐Catalyzed [2+2+1]‐Annulations of 1,6‐Enynes with
<i>N</i>
‐Hydroxyanilines
作者:Deepak B. Huple、Bhanudas D. Mokar、Rai‐Shung Liu
DOI:10.1002/anie.201507946
日期:2015.12
Kinetically unstable nitrones are generated from gold‐catalyzed reactions of 1,6‐enynes with N‐hydroxyanilines, and subsequently trapped by tethered alkenes to furnish [2+2+1]‐annulations. Our experimental data reveal that such nitrones arise from atypical N‐attackchemoselectivity that is triggered by tethered alkenes to facilitate the key protodeauration reaction.
Iridium-Mediated Isomerization−Cyclization of Bicyclic Pauson−Khand Derived Allylic Alcohols
作者:Yvonne Kavanagh、Cíara M. Chaney、Jimmy Muldoon、Paul Evans
DOI:10.1021/jo8017439
日期:2008.11.7
cyclopentenone, with a catalytic amount of (1,5-cyclooctadiene)(pyridine)(tricyclohexylphosphine)iridium(I) hexafluorophosphate 1 (Crabtree's catalyst) under a hydrogen atmosphere resulted in the formation of 4-(toluene-4-sulfonyl)-2-oxa-4-azatricyclo[5.2.1.0(3,8)]decane 12 as a single diastereoisomer. This process is likely to proceed via an initial Ir(I)-mediated isomerization of the alkene to form an N-sulfonyl
Regioselective functionalisation of dibenzothiophenes through gold-catalysed intermolecular alkyne oxyarylation
作者:Matthew J. Barrett、Paul W. Davies、Richard S. Grainger
DOI:10.1039/c5ob01241d
日期:——
Site-selective and direct C–H functionalisation of dibenzothiophenes is achieved using a gold-catalysed oxyarylation approach.
通过金催化的氧化芳基化方法实现了对二苯并噻吩的位选择性和直接C-H官能化。
Nickel-Catalyzed Reductive Cycloisomerization of Enynes with CO<sub>2</sub>
作者:Justin B. Diccianni、Tyler Heitmann、Tianning Diao
DOI:10.1021/acs.joc.7b01034
日期:2017.7.7
carboxylates from petroleum feedstock require a series of oxidation reactions. CO2 represents a cheap and sustainable, preoxidized C1 source. Herein, we describe a simple, selective, and mild procedure for the construction of (hetero)cyclic α,β-unsaturated carboxylic acids from 1,6- and 1,7-enyes and CO2. Terminal 1,7-enynes and stericallyhindered alkenes experience a change in regioselectivity and form
Cyclization reactions of molybdenum and chromium carbene complexes with 1,6- and 1,7-enynes: effect of tether length and composition
作者:Daniel F. Harvey、Kevin P. Lund、David A. Neil
DOI:10.1021/ja00048a012
日期:1992.10
It has been observed that the reaction of 1,6- and 1,7-enynes with pentacarbonyl(butylmethoxycarbene)molybdenum(0) (18) produces vinylcyclopropanes in good to excellent yield. A systematic investigation into the factors which govern the success of these cyclizations has been performed. Chromium carbenecomplexes also lead to the formation of vinylcyclopropanes but in significantly lower yields. When