<i>gem-</i>Difluoroolefination of Diazo Compounds with TMSCF<sub>3</sub> or TMSCF<sub>2</sub>Br: Transition-Metal-Free Cross-Coupling of Two Carbene Precursors
作者:Mingyou Hu、Chuanfa Ni、Lingchun Li、Yongxin Han、Jinbo Hu
DOI:10.1021/jacs.5b09888
日期:2015.11.18
fragment resulting from a diazocompound and a difluorocarbene fragment derived from Ruppert-Prakash reagent (TMSCF3) or TMSCF2Br, has been developed. This gem-difluoroolefination proceeds through the direct nucleophilic addition of diazocompounds to difluorocarbene followed by elimination of N2. Compared to previously reported Cu-catalyzed gem-difluoroolefination of diazocompounds with TMSCF3, which possesses
The comprehensive study of the reactions of carbonylcompounds and ethyl diazoacetate in the presence of a Brønsted acid catalyst is described. In result, a broad range of 3-oxo-esters were synthesized from a variety of ketones and aliphatic aldehydes by 1,2-aryl/alkyl/hydride shift. Aryl–methyl ketones produced only aryl-migrated products, whereas other ketones yielded a mixture of products. For diaryl
A new diversity oriented and metal-free approach to highly functionalized 3H-pyrimidin-4-ones
作者:Renata Riva、Luca Banfi、Andrea Basso、Paola Zito
DOI:10.1039/c0ob00978d
日期:——
A new synthesis of 3H-pyrimidin-4-ones, characterized by four different sets of decorations, is presented. The strategy is based on the synthetic elaboration of readily available α-substituted β-ketoesters that, upon transformation into the corresponding acyl enamines, have been cyclized to give 6H-1,3-oxazin-6-ones. These reactive intermediates have been in turn cleanly converted into highly functionalized pyirimidinones, by treatment with an appropriate primary amine. The whole sequence does not need the use of any metal mediator or catalyst.
Copper-Mediated Deuterotrifluoromethylation of <i>α</i>
?Diazo Esters
作者:Mingyou Hu、Qiqiang Xie、Xinjin Li、Chuanfa Ni、Jinbo Hu
DOI:10.1002/cjoc.201600004
日期:2016.5
ation of α?diazo esters under the promotion of deuterium oxide (D2O) has been developed for the synthesis of deuterium‐labeled trifluoromethyl compounds. This deuterotrifluoromethylation reaction is of broad scope and can afford the deuterated products with higher than 99% isotopic purity. Moreover, the results of this investigation also provide some experimental evidences to support our previously
The influence of substituents on preparation and tautomerism of open-chain β-thioketoesters
作者:F. Duus
DOI:10.1016/0040-4020(72)88125-0
日期:1972.1
the synthesis of β-thioketoesters, the acid catalysed reactions of 36 differently substituted β-keto esters with H2S have been studied under various conditions in order to determine the influence of the substituents on reaction course. gem-Dithiols may also be obtained in good yields by this reaction. Treatment of T1(I)-salts of β-thioketo esters with alkyl halides results exclusively in S-alkylation