Scalable synthesis of enaminones utilizing Gold's reagents
作者:Alexander W. Schuppe、James M. Cabrera、Catherine L.B. McGeoch、Timothy R. Newhouse
DOI:10.1016/j.tet.2017.03.092
日期:2017.6
chloride and N,N-dialkylformamides. These synthetic equivalents of N,N-dimethylformamide dimethyl acetal were used in an optimized and scalable procedure for the regioselective synthesis of a variety of enaminones from ketone starting materials, whose utility was demonstrated by the stereoselective synthesis of Rawal-type dienes.
Base-Promoted Annulative Difluoromethylenation of Enaminones with BrCF<sub>2</sub>CO<sub>2</sub>Et toward 2,2-Difluorinated 2,3-Dihydrofurans
作者:Jinbiao Ying、Ting Liu、Yunyun Liu、Jie-Ping Wan
DOI:10.1021/acs.orglett.2c00671
日期:2022.4.1
A practical method for the synthesis of 2,2-difluorinated 2,3-dihydrofurans has been established via the [4 + 1] annulation of enaminones and BrCF2CO2Et with Na2CO3 promotion. This new protocol does not employ any transition metal reagent and enables the annulative difluoromethylation by the partial cleavage of the C═C double bond. In addition, the further treatment with hydrochloric acid in one pot
通过烯胺酮和BrCF 2 CO 2 Et 与Na 2 CO 3促进的[4 + 1] 环化,建立了一种合成2,2-二氟代2,3-二氢呋喃的实用方法。该新方案不使用任何过渡金属试剂,并通过 C=C 双键的部分裂解实现环状二氟甲基化。此外,在一锅中用盐酸进一步处理会通过形式烯胺酮 C-N 羧化生成 β-酮烯酸(4-氧代-2-丁烯酸)。
Mn(OAc)<sub>3</sub>-Promoted Oxidative C<sub>sp<sup>3</sup></sub>–P Bond Formation through C<sub>sp<sup>2</sup></sub>–C<sub>sp<sup>2</sup></sub> and P–H Bond Cleavage: Access to β-Ketophosphonates
The Mn(OAc)3-promoted oxidative phosphonylation of N,N-dimethylenaminones with H-phosphonates, involving a chemo- and regioselective Csp2–Csp2 bond cleavage and Csp3–P bond formation in one step, provided successfully functionalized β-ketophosphonates under mild reaction conditions. Oxidative Csp3–H/P–H cross-coupling reactions via Csp3–C(C═O) bond cleavage and mechanistic studies are conducted preliminarily
An unprecedented approach toward the general synthesis of α-keto amides has been established by tailoring the CC double bond of enaminones in the presence of CuI and hypervalent iodine.
of thiazole-2-thiones via an oxidative cascade cyclization strategy is described. The novel protocol involves the simultaneous formation of two C—S bonds and a C═S bond on the structure of enaminones in a single operation through a cascade of C(sp2)—H/C(sp3)—Hbond sulfurations and C(sp3)–H bond thiocarbonylation. This transformation allows for the efficient synthesis of thiazole-2-thiones with broad