Cycloisomerization between Aryl Enol Ether and Silylalkynes under Ruthenium Hydride Catalysis: Synthesis of 2,3-Disubstituted Benzofurans
摘要:
Metal-catalyzed cycloisomerization reactions of 1,n-enynes have become conceptually and chemically attractive processes in the search for atom economy, which is. a key subject of current research. However, metal-catalyzed cycloisomerization between aryl enol ether and silylalkynes has not been developed. The ruthenium hydride complex catalyzed cycloisomerization between aryl enol ether and silylalkynes is reported to give benzofurans having useful functional groups, vinyl and trimethylsilylmethyl, on the 2- and 3-positions, respectively.
Palladium-Catalyzed Allylating Heteroannulation of <i>o-</i>Alkynyl-Allyloxybenzenes. A Route to 2-Substituted-3-Allylbenzo[b]furans
作者:Nuno Monteiro、Geneviève Balme
DOI:10.1055/s-1998-1755
日期:1998.7
In the presence of palladium(0), o-alkynyl allyloxybenzenes produce 2-substituted 3-allylbenzo[b]furans in fair yields. This heteroannulation is promoted by the η3-allyl palladium species issued from early reaction of the catalyst with the starting allyl aryl ether.
From Ynamides to Highly Substituted Benzo[<i>b</i>]furans: Gold(I)-Catalyzed 5<i>-endo-dig</i>-Cyclization/Rearrangement of Alkylic Oxonium Intermediates
作者:Maria Camila Blanco Jaimes、Vanessa Weingand、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/chem.201301595
日期:2013.9.9
A series of arylynamides with alkyloxy groups at the ortho position of the aryl group was prepared through a short alkylation/cross‐coupling/amidation sequence. The gold‐catalyzed conversion of these substrates combined both CO and CC formation steps, thus providing benzofurans with amine functionalities at the 2‐position and alkyl groups at the 3‐position. Cross‐over experiments showed that the
Iridium-Catalyzed Intramolecular Cycloisomerization between Functionalized Alkyne with Aryl Vinyl Ether: Synthesis of 2-Vinyl-3-functionalized Methylbenzofurans
We have developed cycloisomerization between an aryl vinylether and a functionalized alkyne, such as silylalkyne, to give 2,3-disubstituted benzofuran derivatives using [IrCl(cod)]2, PCy3, and NaBArF4. This catalyst system not only catalyzes the above cycloisomerization but also isomerize a terminal olefin to give an aryl vinylether.
我们已经开发出芳基乙烯基醚与官能化炔烃(例如甲硅烷基炔烃)之间的环异构化,从而使用[IrCl(cod)] 2,PCy 3和NaBAr F 4生成2,3-二取代的苯并呋喃衍生物。该催化剂体系不仅催化上述环异构化,而且使末端烯烃异构化以得到芳基乙烯基醚。
Tandem Enyne Metathesis-Diels−Alder Reaction for Construction of Natural Product Frameworks
Enynes connected through aromatic rings are used as substrates for metathesis reactions. The reactivity of three ruthenium carbene complexes is compared. The resulting 1,3-dienes are suitable precursors of polycyclic structures via a Diels−Alder process. Some domino RCM-Diels−Alder reactions are performed, suggesting a possible beneficial effect of the ruthenium catalyst in the cycloaddition process
A novel stereoselective photoinduced intramolecular cyclization of 1-(o-allyloxyphenyl)-2-pentamethyldisilanyl ethynes
作者:Sang Chul Shim、Seung Ki Park
DOI:10.1016/s0040-4039(98)01444-0
日期:1998.9
Photolysis of 1-(o-allyloxyphenyl)-2-pentamethyldisilanyl ethynes1a and 1b in benzene provides novel stereoselective intramolecularcyclization products 3a and 3b.