Metal Free, Direct and Selective Deoxygenation of α-Hydroxy Carbonyl Compounds: Access to α,α-Diaryl Carbonyl Compounds
作者:Sandeep、Paloth Venugopalan、Anil Kumar
DOI:10.1002/ejoc.202000142
日期:2020.5.10
A variety of α‐hydroxy‐α,α‐diaryl carbonylcompounds are selectively deoxygenated to give an important class of α,α‐diaryl carbonylcompounds using catalytic amount of aqueous HClO4 (70 %) and triethylsilane as hydride source.
Copper/P(<i>t</i>
Bu)<sub>3</sub>
-Mediated Regiospecific Synthesis of Fused Furans and Naphthofurans
作者:Togati Naveen、Arghya Deb、Debabrata Maiti
DOI:10.1002/anie.201609401
日期:2017.1.19
to construct substituted fused furans and naphthofurans from readily available starting materials under mild reaction conditions. The utility of the method is further demonstrated by the synthesis of chiral furans from (R)‐(−)‐carvone and (S)‐(+)‐carvone. A plausible mechanism involving the oxidative radical cyclization has been suggested based on experimental observations.
Facile synthesis of benzofurans via copper-catalyzed aerobic oxidative cyclization of phenols and alkynes
作者:Wei Zeng、Wanqing Wu、Huanfeng Jiang、Liangbin Huang、Yadong Sun、Zhengwang Chen、Xianwei Li
DOI:10.1039/c3cc42326c
日期:——
synthesis of polysubstituted benzofurans using a copper catalyst and molecular oxygen from phenols and alkynes in a one-pot procedure has been reported. The transformation consists of a sequential nucleophilic addition of phenols to alkynes and oxidative cyclization. A wide variety of phenols and alkynes can be used in the same manner.
Direct Access to Benzo[<i>b</i>]furans through Palladium-Catalyzed Oxidative Annulation of Phenols and Unactivated Internal Alkynes
作者:Malleswara Rao Kuram、M. Bhanuchandra、Akhila K. Sahoo
DOI:10.1002/anie.201210217
日期:2013.4.22
2,3‐Disubstituted benzo[b]furans are prepared in one step from commercially available phenols and readily accessible unactivatedinternalalkynes (see scheme). This Pd‐catalyzed oxidativeannulation has a broad substrate scope and allows access to a wide range of benzo[b]furans.
2,3-二取代的苯并[ b ]呋喃一步一步由市售的苯酚和易于获得的未活化内部炔烃制得(参见方案)。这种Pd催化的氧化环化具有广泛的底物范围,并允许使用各种苯并[ b ]呋喃。
Condensations of benzil with phenols and aryl ethers mediated by tin(IV) chloride pentahydrate
作者:Brian J Morrison、Oliver C Musgrave
DOI:10.1016/s0040-4020(02)00357-5
日期:2002.5
The reaction of benzil with phenol at 180°C in the presence of SnCl4·5H2O produces a benzofuran, a benzofuranol, a benzodifuran, and a benzofuranone. Anhydrous tin(IV) chloride also gives a benzofuranofuranone. Other phenols and their methyl ethers yield related products. The good yields of the benzo- and naphtho-furanones make the method an attractive alternative to the benzilic acid route to such