N '-(2-炔基亚苄基)酰肼,α,β-不饱和羰基化合物与溴的三组分反应在不同条件下产生了不同的结果。当以DABCO为碱在70°C下于NMP中于NMP中进行反应时,获得了6-溴H-吡唑并[5,1- a ]异喹啉,而6-溴-1,2,3,10 b-四氢吡唑并已获得了6-溴H-吡唑并[5,1- a ]异喹啉。当反应在10 K的DMAc中以K 3 PO 4为碱存在时,提供[5,1- a ]异喹啉。
Synthesis of H-Pyrazolo[5,1-a]isoquinolines via Copper(II)-Catalyzed Oxidation of an Aliphatic C−H Bond of Tertiary Amine in Air
摘要:
A multicomponent reaction of 2-alkynylbenzaldehyde, sulfonohydrazide, and tertiary amine is discovered, which generates the unexpected H-pyrazolo[5,1-a]isoquinolines in good yields under mild conditions. In the reaction process, silver(I)-catalyzed intramolecular cyclization and copper(II)-catalyzed oxidation of an aliphatic C-H bond of tertiary amine in air are involved.
Metal Cocatalyzed Tandem Alkynylative Cyclization Reaction of in Situ Formed<i>N</i>-Iminoisoquinolinium Ylides with Bromoalkynes via C–H Bond Activation
Silver triflate and copper(I) iodide cocatalyzed direct alkynylation and cyclization reaction of in situ formed N-iminoisoquinolinium ylides with bromoalkynes is described. The reaction proceeds efficiently through a combination of C–H activation and subsequent tandem reaction in one pot, leading to diverse H-pyrazolo[5,1-a]isoquinolines in good yields under mild reaction conditions.
描述了三氟甲磺酸银和碘化铜(I)共同催化原位形成的N-亚氨基异喹啉鎓碘化物与溴炔烃的直接炔基化和环化反应。在一个反应釜中,通过C–H活化和随后的串联反应的组合,该反应得以有效进行,从而在温和的反应条件下以高收率产生了多种H-吡唑并[5,1- a ]异喹啉。
Generation of Polyfluoroaryl‐Fused
<i>H</i>
‐Pyrazolo[5,1‐
<i>a</i>
]isoquinolines through a Reaction of
<i>N</i>
′‐(2‐Alkynylbenzylidene)hydrazide with Polyfluoroarene
作者:Ling Zhang、Qian Xiao、Shengqing Ye、Jie Wu
DOI:10.1002/asia.201200227
日期:2012.8
Polyfluoroarene reacts with N′‐(2‐alkynylbenzylidene)hydrazide catalyzed by silver triflate in the presence of cesium carbonate, leading to polyfluoroaryl‐fusedH‐pyrazolo[5,1‐a]isoquinolines in good yields.
Synthesis of pyrazolo[5,1-a]isoquinolines via silver(i)–rhodium(i) cooperative catalysis in the reaction of N′-(2-alkynylbenzylidene)hydrazide with cycloprop-2-ene-1,1-dicarboxylate
作者:Liangqing Yao、Xingxin Yu、Chen Mo、Jie Wu
DOI:10.1039/c2ob26824h
日期:——
A tandemreaction between N′-(2-alkynylbenzylidene)hydrazide and cycloprop-2-ene-1,1-dicarboxylate co-catalyzed by silver triflate and tris(triphenylphosphine)rhodium chloride is reported. The reaction proceeds through 6-endo-cyclization, [3 + 2] cycloaddition, cyclopropane opening, and aromatization, leading to pyrazolo[5,1-a]isoquinolines in moderate to good yields.
N '-(2-炔基亚苄基)酰肼与环丙-2-烯-1,1-二羧酸酯共催化下的串联反应三氟甲磺酸银报道了三(三苯基膦)氯化铑。该反应通过6-内-cyclization,[3 + 2]环加成,环丙烷打开并进行芳构化,导致吡唑并[5,1- a ]异喹啉的产量适中至良好。
Silver triflate-catalyzed tandem reaction of N′-(2-alkynylbenzylidene)hydrazide with pyridyne
作者:Lingyong Jiang、Xingxin Yu、Bing Fang、Jie Wu
DOI:10.1039/c2ob26379c
日期:——
A silver triflate-catalyzed tandem reaction of N′-(2-alkynylbenzylidene)hydrazide with pyridyne is presented. Different outcomes are obtained, depending on the pyridynes utilized in the transformation.
A cascade reaction of N'-(2-alkynylbenzylidene)hydrazide with allenoate in the presence of dioxygen co-catalyzed by silver triflate and copper(II) acetate under mild conditions is described, which provides an efficient approach to 2-carbonyl H-pyrazolo[5,1-a]isoquinolines.