An efficient copper-catalyzed formation of highly substituted pyrazoles using molecular oxygen as the oxidant
作者:Mamta Suri、Thierry Jousseaume、Julia J. Neumann、Frank Glorius
DOI:10.1039/c2gc35476d
日期:——
An efficient Cu-catalyzed formation of tetra-substituted pyrazoles is reported. In this atom economic process, readily available enamines and nitriles are reacted by C–C and N–N bond formation. Oxygen has been successfully used as the oxidant, which has important economic and environmental advantages. A broad scope of enamines and nitriles can be utilized in this process.
A novel pentafluorobenzenesulfonyl hypervalent iodonium ylide 3 was designed and synthesized as a useful tool for the preparation of sulfur pentafluorophenyl compounds containing a C6F5S or C6F5SO2 unit. Electrophilic pentafluorophenylthiolation of enamines, formal [3+2] cycloaddition reaction of nitriles and alkynes, and intramolecular SNAr cyclization were achieved using iodonium ylide 3. The fluoro-click
设计并合成了新颖的五氟苯磺酰基高价碘鎓叶立德3,作为制备含C 6 F 5 S或C 6 F 5 SO 2单元的硫五氟苯基化合物的有用工具。烯胺的亲电子五氟苯硫基化,腈和炔的正式[3 + 2]环加成反应以及分子内S N Ar环化反应均使用碘鎓碘化物3。氟点击反应使用通过分子间S中的产品之一还证明Ñ与亲核试剂heterocentered氩反应。
Trifluoromethanesulfonyl Hypervalent Iodonium Ylide for Copper-Catalyzed Trifluoromethylthiolation of Enamines, Indoles, and β-Keto Esters
A novel electrophilic-type trifluoromethylthiolation reagent, a trifluoromethanesulfonyl hypervalentiodoniumylide, was designed and reacted well with various nucleophiles to afford the desired CF3S-substituted products. In situ reduction of the trifluoromethanesulfonyl group to give the trifluoromethylthio group, which is the key step in this process, was realized in the presence of copper(I) chloride
Radical reactions of [60]fullerene with β-enamino carbonyl compounds mediated by manganese(<scp>iii</scp>) acetate
作者:Guan-Wu Wang、Hai-Tao Yang、Chun-Bao Miao、Yu Xu、Fei Liu
DOI:10.1039/b604626f
日期:——
Manganese(III) acetate dihydrate-mediated reactions of [60]fullerene with beta-enamino carbonyl compounds afforded [60]fullerene-fused pyrroline derivatives, of which the nitrogen atom is directly connected to the fullerene cage. A possible reactionmechanism is proposed.
Phosphotungstic Acid Catalysed Synthesis of β-Enamino Compounds under Solvent-Free Conditions
作者:Geng-Chen Li
DOI:10.3184/030823407x273488
日期:2007.12
developed for the synthesis of β-enaminones and β-enamino esters by reacting 1,3-dicarbonyl compounds with amines in the presence of catalytic amounts of phosphotungstic acid (H3PW12O40, 1 mol%). The reaction proceeds smoothly at room temperature under solvent-free conditions and gives the corresponding β-enamino compounds in high to excellent yields.