Disclosed herein is an efficient synthetic route for the synthesis of functionalized 2-benzyl benzo[b]furans via a regioselective 5-exo-trig intramolecular oxidative cyclization of ortho-cinnamyl phenols using [PdCl2(CH3CN)2] as catalyst and benzoquinone as an oxidant. Further, a sequential ortho-cinnamylation of phenols using cinnamyl alcohols catalyzed by Re2O7, followed by an oxidative cyclization
本文所公开的是用于官能化的2-苄基苯并[合成的有效合成路线b ]呋喃经由区域选择性5 -外-TRIG分子内的氧化环化邻-使用肉桂酚[的PdCl 2(CH 3 CN)2 ]作为催化剂和苯醌作为氧化剂。此外,使用由Re 2 O 7催化的肉桂醇对苯酚进行邻位邻肉桂酸化,然后使用上述Pd催化剂进行氧化环化。反应显示出广泛的底物范围,具有良好至优异的产率。
Chemoselective efficient synthesis of functionalized β-oxonitriles through cyanomethylation of Weinreb amides
作者:Ashenafi Damtew Mamuye、Laura Castoldi、Ugo Azzena、Wolfgang Holzer、Vittorio Pace
DOI:10.1039/c4ob02398f
日期:——
Homologation of Weinreb amides with cyanomethyllithium: a new route to β-oxonitriles.
Weinreb酰胺与氰甲基锂的同源化反应:β-氧代腈的新途径。
Pd-Catalyzed Asymmetric Allylic Substitution Cascade of But-2-ene-1,4-diyl Dimethyl Dicarbonate for the Synthesis of Chiral 2,3-Dihydrofurans
Herein an efficient Pd-catalyzed asymmetricallylicsubstitution cascade of both (E)- and (Z)-but-2-ene-1,4-diyl dimethyl dicarbonates with α-substituted cyano ketones is described for the preparation of chiral 2,3-dihydrofurans in up to 97% yield with 98% ee. A suggested steric control process has been proposed to illustrate the differences in enantioselectivity between the reactions of (E)- and (Z)-allyl
Catalytic Activation of 1-Cyano-3,3-dimethyl-3-(1<i>H</i>)-1,2-benziodoxole with B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> Enabling the Electrophilic Cyanation of Silyl Enol Ethers
cyano group, 1-cyano-3,3-dimethyl-3-(1H)-1,2-benziodoxole (CDBX), with B(C6F5)3, to achieve the catalytic electrophilic cyanation of silyl enolethers is presented. Mechanistic studies indicate that CDBX is activated through coordination of its cyano group to B(C6F5)3, thus enabling the electrophilic cyanation reaction to occur.
含有可转移氰基,1-氰基-3,3-二甲基-3-(1 H)-1,2-苯并恶唑(CDBX)和B(C 6 F 5)3的高价碘试剂的路易斯酸性活化提出了实现甲硅烷基烯醇醚的催化亲电子氰化的方法。机理研究表明,CDBX通过其氰基与B(C 6 F 5)3配位而被激活,从而使亲电氰化反应发生。
Hoveyda–Grubbs II Catalyst: A Useful Catalyst for One-Pot Visible-Light-Promoted Ring Contraction and Olefin Metathesis Reactions
A one-pot reaction to synthesize functionalized 2H-azirines through visible-light-mediated ring contraction and olefinmetathesis of isoxazoles is described. Hoveyda–Grubbs II catalyst was found to function as a photocatalyst for these transformations, allowing these processes to be carried out in a one-pot manner. This study offers a new entry for the application of Grubbs catalysts as efficient photocatalysts