Recyclable heterogeneous gold(I)-catalyzed oxidation of internal acylalkynes: Practical access to vicinal tricarbonyls
作者:Wenli Hu、Bin Huang、Bingbo Niu、Mingzhong Cai
DOI:10.1016/j.tetlet.2021.152953
日期:2021.3
A highly efficient heterogeneous gold(I)-catalyzed oxidation of internal acylalkynes has been developed using 2,6-dichloropyridine N-oxide as the oxidant in dichloromethane (CH2Cl2) at room temperature, providing a novel and practical approach for the construction of diverse vicinal tricarbonyls such as α,β-diketoesters, 1,2,3-triketones, and α,β-diketoamides in good to excellent yields. The heterogeneous
cascade reaction of 2,3-diketoesters, aromatic amines, and 1,3-cyclohexanediones has been developed for the highly enantioselectivesynthesis of axially chiral N-arylindoles. The success of this method derivesfrom the use of a newly developed second-generation chiral spirocyclic phosphoric acid as the catalyst. In addition, this protocol was extended to the synthesis of an axially chiral monophosphorus
A novel reaction of vicinal tricarbonyl compounds with the isocyanide–DMAD zwitterion: formation of highly substituted furan derivatives
作者:Vijay Nair、Ani Deepthi
DOI:10.1016/j.tetlet.2006.01.036
日期:2006.3
The vicinaltricarbonyl system participates in a novel reaction with the zwitterion derived from isocyanide and dimethyl acetylenedicarboxylate to form fully substituted furan derivatives.
Herein, we present a facile three-component reaction of 2,3-diketoesters, ammonium acetate and ketones that yielded a variety of N-unsubstituted 1H-pyrrol-3(2H)-ones in moderate to good yields. Subsequently, base-induced divergent N–H and C–C bond derivatizations of N-unsubstituted 1H-pyrrol-3(2H)-ones were revealed. By using NaH as the base, N-alkylation, acylation and sulfonylation occur smoothly
在此,我们提出了一种简单的 2,3-二酮酯、乙酸铵和酮的三组分反应,以中等至良好的产率产生各种N-未取代的1 H-吡咯-3(2 H )-酮。随后,揭示了N -未取代的1 H -pyrrol-3(2 H )-ones 的碱基诱导的 N-H 和 C-C 键衍生化。以NaH为碱,N-烷基化、酰化和磺酰化反应顺利进行。当使用 NaOH 时,发生 C–C(=O) 裂解并发生进一步的迈克尔加成反应,导致在 1 H -pyrrol-3(2 H )-one 骨架的 2 位安装烷基链。