Facile synthesis of α-alkoxyl amides <i>via</i> scandium-catalyzed oxidative reaction between ynamides and alcohols
作者:Zhi-Xin Zhang、Bo-Han Zhu、Pei-Xi Xie、Jia-Qi Tang、Xin-Ling Li、Chunyin Zhu、Ying-Wu Yin、Long-Wu Ye
DOI:10.1039/c8ra03842b
日期:——
A novel and efficient scandium-catalyzed oxidativereaction between ynamides and alcohols for the facilesynthesis of various α-alkoxyl amides is reported in this paper. The reaction avoids the need for the use of α-diazo carbonyls which are unstable and may cause some safety concerns. Instead, by using alkynes as the starting materials, this protocol features readily available substrates, compatibility
A Combination of Copper(0) Powder and Selectfluor Enables Generation of Cationic Copper Species for Mild 1,2-Dicarbonylation of Alkynes
作者:Yunkui Liu、Wenxia Zhang、Jian Zhang、Zhenyuan Xu
DOI:10.1055/s-0033-1338983
日期:——
A combination of copper powder and Selectfluor permits the generation of cationic copper species that efficiently catalyze 1,2-dicarbonylation of alkynes under mild conditions with water and dioxygen as inexpensive and environmentally benign sources of oxygen.
Gold-Catalyzed Synthesis of Benzil Derivatives and α-Keto Imides via Oxidation of Alkynes
作者:Cheng-Fu Xu、Mei Xu、Yi-Xia Jia、Chuan-Ying Li
DOI:10.1021/ol200270t
日期:2011.3.18
An efficient process based on the gold-catalyzed redox reaction has been developed to oxidize 1,2-diarylacetylene or ynamide to 1,2diaryldiketone or a-keto imide respectively. This process can tolerate a variety of functional groups and affords 1,2-dicarbonyl compounds in excellent yields under mild reaction conditions.
Direct oxidation of <i>N</i>-ynylsulfonamides into <i>N</i>-sulfonyloxoacetamides with DMSO as a nucleophilic oxidant
microwave assistance. DFT calculations indicate that DMSO nucleophilicallyattacks the ethylic triple bond and transfers its oxygenatom to the triple bond to form zwitterionic anionic N-sulfonyliminiums to trigger the reaction. Then it nucleophilicallyattacks the generated iminium intermediates to accomplish the oxidation via the second oxygenatom transfer. The current method provides a straightforward