convenient method for the one-pot synthesis of furans from β-keto esters and α-halo ketones was developed using an acid- and base-supported reagent system ‘Na2CO3/Al2O3-PPA/SiO2’. The condensation reaction of triketones, which are formed from the reaction of β-keto esters with α-halo ketones in the presence of Na2CO3/Al2O3, was promoted by PPA/SiO2 to give the corresponding furans in good yields. This method
开发了一种方便的方法,可使用酸和碱支持的试剂系统'Na 2 CO 3 / Al 2 O 3 -PPA / SiO 2 '从β-酮酯和α-卤代酮一锅合成呋喃。PPA / SiO 2促进了β-酮酸酯与α-卤代酮在Na 2 CO 3 / Al 2 O 3存在下的反应而形成的三酮缩合反应,得到了相应的呋喃。产量。与分步法相比,该方法简单易行,收率好。 呋喃-一锅合成-支持的试剂
The Rearrangement of <i>tert</i>-Butylperoxides for the Construction of Polysubstituted Furans
作者:Xiaojian Zheng、Shenglin Lu、Zhiping Li
DOI:10.1021/ol402509u
日期:2013.11
The Brønsted acid catalyzed rearrangement of tert-butyl peroxides provides a new strategy to construct 2,3-disubstituted furans via 1,2-aryl migration. In addition, tert-butyl peroxides could also be transformed into 2,3,5-trisubstituted or 2,5-disubstitutedfuransthrough a sequence of base-catalyzed Kornblum–DelaMare rearrangements and acid-promoted Paal–Knorr reactions.
A convenient and straightforward strategy for the synthesis of 2,3-disubstituted and 2,3,5-trisubstituted furans via a base-promoted domino reaction of β-keto compounds with vinyl dichlorides is described. This transition-metal-free approach proceeds under operationally simple reaction conditions featuring easily available starting materials, a broad substrate scope, and good functional group tolerance
Regioselective Synthesis of Multisubstituted Furans via Metalloradical Cyclization of Alkynes with α-Diazocarbonyls: Construction of Functionalized α-Oligofurans
作者:Xin Cui、Xue Xu、Lukasz Wojtas、Martin M. Kim、X. Peter Zhang
DOI:10.1021/ja309446n
日期:2012.12.12
five-membered furan structures. The Co(II) complex of 3,5-Di(t)Bu-IbuPhyrin, [Co(P1)], is effective in catalyzing the metalloradical cyclization reaction under neutral and mild conditions. The [Co(P1)]-catalyzed process tolerates a wide range of α-diazocarbonyls and terminal alkynes with varied steric and electronic properties, producing polyfunctionalized furans with complete regioselectivity. The catalytic