CuI/<i>N</i>,<i>N</i>-Dimethylglycine-Catalyzed Cross-Coupling Reaction of Vinyl Halides with Phenols and its Application to the Assembly of Substituted Benzofurans
作者:Dawei Ma、Qian Cai、Xiaoan Xie
DOI:10.1055/s-2005-871543
日期:——
Cul-catalyzed coupling reaction of vinylhalides and phenols occurs at 60-90 °C with N,N-dimethylglycine hydrochloride as the additive, giving vinylarylethers in good yields. The cross-coupling products formed from o-iodophenols and vinyl iodides are converted into substituted benzofurans via an intramolecular Heck reaction.
Cul 催化的卤乙烯和苯酚的偶联反应在 60-90 °C 下发生,N,N-二甲基甘氨酸盐酸盐作为添加剂,以良好的收率得到乙烯基芳基醚。由邻碘苯酚和乙烯基碘形成的交叉偶联产物通过分子内 Heck 反应转化为取代的苯并呋喃。
Nucleophilic Aromatic Substitution on Tricarbonylchromium-complexed Haloarenes: Synthesis of<i>O</i>-Aryloximes and Their Cyclization to Benzofurans
作者:Andreina Alemagna、Clara Baldoli、Paola Del Buttero、Emanuela Licandro、Stefano Maiorana
DOI:10.1055/s-1987-27888
日期:——
A series of O-aryloximes have been prepared from tricarbonylchromium-complexed haloarenes in mild conditions. Title compounds are starting materials for benzofuran synthesis.
Pd-Catalyzed O-Arylation of Ethyl Acetohydroximate: Synthesis of <i>O</i>-Arylhydroxylamines and Substituted Benzofurans
作者:Thomas J. Maimone、Stephen L. Buchwald
DOI:10.1021/ja1044874
日期:2010.7.28
An efficient Pd catalyst for the O-arylation of ethyl acetohydroximate with aryl chlorides, bromides, and iodides has been developed. Ethyl acetohydroximate serves as an efficient hydroxylamine equivalent for C-O cross-coupling, thereby allowing for the preparation of O-arylhydroxylamines from simple aryl halides. Short reaction times and broad substrate scope, including heteroaryl coupling partners, allow access to O-arylhydroxylamines that would be difficult to prepare in a single step by traditional methods. Moreover, the O-arylated products so formed can be directly transformed into substituted benzofurans in a single operation.
ALEMAGNA A.; BALDOLI G.; DEL BUTTERO P.; LICANDRO E.; MAIORANA S., SYNTHESIS,(1987) N 2, 192-196
作者:ALEMAGNA A.、 BALDOLI G.、 DEL BUTTERO P.、 LICANDRO E.、 MAIORANA S.
DOI:——
日期:——
Cascade Palladium-Catalyzed Direct Intramolecular Arylation/Alkene Isomerization Sequences: Synthesis of Indoles and Benzofurans
作者:Myriam Yagoubi、Ana C. F. Cruz、Paula L. Nichols、Richard L. Elliott、Michael C. Willis
DOI:10.1002/anie.201004097
日期:2010.10.18
One route, two cycles: A palladium‐catalyzed intramoleculardirectarylation reaction combined with an isomerization step provided a straightforward synthetic route to both indoles and benzofurans (see scheme). Isolation and functionalization of intermediate alkene isomers allowed the formation of variants having substituents remote from the core.