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
Rhodium(III)-Catalyzed Regioselective Decarboxylative Cyclization for the Synthesis of 4<i>H</i>-Furo[3,2-<i>c</i>]chromen-4-one Derivatives
作者:Dandan Zha、Hongji Li、Shiqing Li、Lei Wang
DOI:10.1002/adsc.201600974
日期:2017.2.2
This contribution describes a regioselective cyclization of hypervalent iodine reagents (HIR) with propiolic acids in the presence of a rhodium catalyst. The mild decarboxylation can tolerate a wide range of groups and generates 4H‐furo[3,2‐c]chromen‐4‐one derivatives in good isolated yields.
该贡献描述了在铑催化剂存在下用丙酸对高价碘试剂(HIR)的区域选择性环化。轻度的脱羧可以耐受广泛的基团,并以良好的分离产率生成4 H-呋喃[3,2 - c ] chromen-4-one衍生物。
Regioselective Synthesis of Highly Functionalized Furans Through the Ru<sup>II</sup>-Catalyzed [3+2] Cycloaddition of Diazodicarbonyl Compounds
作者:Likai Xia、Yong Rok Lee
DOI:10.1002/ejoc.201402067
日期:2014.6
A novel method for the RuII-catalyzed regioselective synthesis of highly functionalized furans from readily available cyclic and acyclic diazodicarbonyl compounds and terminal alkynes is described. The devised protocol offers a straightforward means to the construction of a variety of diverse furan derivatives through powerful cascade processes, including the formation of ruthenium carbenoid, cyclopropenation
Synthesis of oxazole and furan derivatives <i>via</i> Rh<sub>2</sub>(OAc)<sub>4</sub>-catalyzed C≡X bond insertion of cyclic 2-diazo-1,3-diketones with nitriles and arylacetylenes
作者:Chenli Fan、Xinwei He、Yin Zuo、Yongjia Shang
DOI:10.1080/00397911.2018.1473441
日期:2018.11.2
Abstract A convenient and efficient procedure for the synthesis of 2-substituted-6,7-dihydrobenzo[d]oxazol-4(5H)-ones and 2-aryl-6,7-dihydrobenzofuran-4(5H)-ones through a Rh2(OAc)4-catalyzed C≡X (X = N, C) insertion of cyclic 2-diazo-1,3-diketones with nitriles and aromatic alkynes has been developed. This reaction uses readily available starting materials and stable cyclic 2-diazo-1,3-diketone compounds
摘要 一种通过 Rh2 合成 2-取代-6,7-二氢苯并[d]恶唑-4(5H)-酮和2-芳基-6,7-二氢苯并呋喃-4(5H)-酮的简便有效方法(OAc)4 催化的 C≡X (X = N, C) 插入环状 2-重氮-1,3-二酮与腈和芳香炔已被开发。该反应使用容易获得的起始材料和稳定的环状 2-重氮-1,3-二酮化合物,以良好至高产率形成所需产物。提出了涉及该反应的 C≡X 键插入和 1,5-偶极电环化/开环和环化序列的初步机制。图形概要