已经开发出一种有效的直接合成吡唑并[5,1- a ]异吲哚的方法,该方法利用钯催化的1-(2-卤代苄基)吡唑的分子内CH键活化作用。发现在这些反应中必须使用氯化锂(LiCl),以抑制当C-3未取代时在吡唑并[5,1- a ]异吲哚的C-3位置的进一步CH键活化。该方案可用于通过顺序的分子内和分子间CH键活化合成具有六元中心环系统的吡唑并[5,1- a ]异喹啉和完全取代的吡唑并[5,1- a ]异吲哚。
Phosphine-Catalyzed [3+2] Cycloaddition Reactions of Azomethine Imines with Electron-Deficient Alkenes: A Facile Access to Dinitrogen-Fused Heterocycles
for the phosphine‐catalyzed [3+2] cycloadditionreaction of azomethineimines with diphenylsulfonyl alkenes to give dinitrogen‐fused bi‐ or tricyclic heterocyclic compounds in high yields has been described. Moreover, two phenylsulfonyl groups installed on the heterocyclic products could be conveniently removed or transformed to other functional groups, making the reaction more useful.
Direct Synthesis of Pyrazolo[5,1‐
<i>a</i>
]isoindoles
<i>via</i>
Intramolecular Palladium‐Catalyzed CH Bond Activation
作者:Young Lok Choi、Hyuk Lee、Bum Tae Kim、Kihang Choi、Jung‐Nyoung Heo
DOI:10.1002/adsc.201000260
日期:2010.10.9
An efficient, directsynthesis of pyrazolo[5,1-a]isoindoles employing a palladium-catalyzed intramolecular CH bondactivation of 1-(2-halobenzyl)pyrazoles has been developed. The use of lithium chloride (LiCl) was found to be essential in these reactions, to suppress further CH bondactivation at the C-3 position of pyrazolo[5,1-a]isoindole, when C-3 is unsubstituted. This protocol can be applied to
已经开发出一种有效的直接合成吡唑并[5,1- a ]异吲哚的方法,该方法利用钯催化的1-(2-卤代苄基)吡唑的分子内CH键活化作用。发现在这些反应中必须使用氯化锂(LiCl),以抑制当C-3未取代时在吡唑并[5,1- a ]异吲哚的C-3位置的进一步CH键活化。该方案可用于通过顺序的分子内和分子间CH键活化合成具有六元中心环系统的吡唑并[5,1- a ]异喹啉和完全取代的吡唑并[5,1- a ]异吲哚。
Catalyst-free and oxidant-free tandem aza-Mannich/cyclization/aromatization of <i>C</i>,<i>N</i>-cyclic azomethine imines with enamides: facile synthesis of 5,6-dihydropyrazolo[5,1-<i>a</i>]isoquinolines
作者:Hao Dong、Yongxing Zhang、Xiaochen Tian、Ruochen Pang、Weiwu Ren、Yang Wang
DOI:10.1039/d2gc01275h
日期:——
tandem aza-Mannich/cyclization/aromatization reaction of C,N-cyclic azomethine imines with enamides has been developed. This practical one-step protocol enables a simple and environmentally friendly route toward the straightforward synthesis of highly substituted 5,6-dihydropyrazolo[5,1-a]isoquinolines. Different types of enamides and enamines, especially enamides derived from marketed drugs as well as bioactive
开发了一种新型高效的无催化剂、无氧化剂串联氮杂曼尼希/环化/芳构化C , N-环偶氮甲亚胺与烯酰胺反应。这种实用的一步法为直接合成高度取代的 5,6-二氢吡唑并[5,1- a ] 异喹啉提供了一种简单且环保的途径。不同类型的烯酰胺和烯胺,尤其是衍生自上市药物以及生物活性分子的烯酰胺,是合适的底物。CB1 大麻素受体拮抗剂可以基于该方法有效合成,说明这将是合成有价值的结构基序的实用策略。