[EN] IMIDAZO-PYRAZINE DERIVATIVES USEFUL AS SOLUBLE GUANYLATE CYCLASE ACTIVATORS [FR] DÉRIVÉS D'IMIDAZO-PYRAZINE UTILES EN TANT QU'ACTIVATEURS DE GUANYLATE CYCLASES SOLUBLES
An environmentally benign cascade reaction of chromone-3-carboxaldehydes with ethyl 2-(pyridine-2-yl)acetate derivatives for highly site-selective synthesis of quinolizines and quinolizinium salts in water
作者:Li Chen、Rong Huang、Kun Li、Xing-Han Yun、Chang-Long Yang、Sheng-Jiao Yan
DOI:10.1039/d0gc02460k
日期:——
quinolizinium salts (4) from chromone-3-carboxaldehydes 1 with ethyl 2-(pyridine-2-yl)acetate derivatives 2via an unprecedented cascade reaction in water was constructed. As a result, functionalized quinolizines (3) bearing a chromone skeleton were prepared by simple reflux of the mixture of chromone-3-carboxaldehydes with ethyl 2-(pyridine-2-yl)acetate derivatives in water. Quinolizinium salts (4) were
Multicomponent Tether Catalysis Synthesis of Highly Functionalized 4-(Pyridin-2-ylmethyl)-2-aminopyrroles via Cascade Reaction Is Accompanied by Decarboxylation
作者:Kun Li、Li Chen、Yun-Xiang Fan、Yao Wei、Sheng-Jiao Yan
DOI:10.1021/acs.joc.9b01814
日期:2019.9.20
catalysis protocol for the synthesis of 4-(pyridin-2-ylmethyl)-2-aminopyrroles (PMAPs) was constructed by simply refluxing a mixture of ethyl 2-(pyridin-2-yl)acetates 1 and various types of arylglyoxal monohydrates 2 and different heterocyclic ketene aminals 3 in EtOH solvent. Based on this reaction, a series of highly functionalized PMAPs were obtained through a novel cascadereaction accompanied by a decarboxylation
Cu-Catalyzed Oxidative [3 + 2] Annulation of 2-(Pyridine-2-yl)acetates with Maleimides: Synthesis of 1<i>H</i>-Pyrrolo[3,4-<i>b</i>]indolizine-1,3-diones
作者:Kai-Hong Lv、Qing-Sheng Zhao、Ke-Hua Zhao、Jia-Ming Yang、Sheng-Jiao Yan
DOI:10.1021/acs.joc.2c01879
日期:2022.11.18
A novel protocol for the construction of highly functionalized indolizine derivatives, that is, 1H-pyrrolo[3,4-b]indolizine-1,3-diones (PIZDOs, 3) from 2-(pyridine-2-yl)acetates and maleimides via a regioselective oxidative [3 + 2] annulation was developed. The cascade oxidative reaction was enabled by heating a mixture of the two substrates in the presence of Ag2CO3 as an oxidant and Cu(OAc)·H2O as
The first direct catalytic asymmetricMannichreaction of 2-alkylazaarenes and ketimines was realized with a chiral Cu–bis(oxazoline) complex as the catalyst. The asymmetric addition of 2-alkylpyridines to isatin-derived ketimines proceeded smoothly to afford α,β-functionalized 2-substituted pyridines bearing 3-amino-3,3-disubstituted oxindole motifs with excellent results (≤99% yield, 99:1 dr, and
I2−catalyzed cascade annulation of 2-(pyridin−2−yl)acetate derivatives with ,−dimethylenamine ketones: Site-selective synthesis of functionalized indolizines
作者:Yuan-Da Li、Wei-Min Zhang、Ke-Hua Zhao、Cong-Hai Zhang、Sheng-Jiao Yan
DOI:10.1016/j.tet.2024.134015
日期:2024.6
A novel synthesis method was developed for developing functionalized indolizines. In this reaction, 2-(pyridin-2-yl)acetate derivatives and ,-dimethylenamine ketones were used as substrates. All these processes were enabled by heating a mixture of starting materials in toluene and in the presence of I under air. Cascade reaction resulted in the formation of two bonds and cleavage of one bond in one
开发了一种用于开发功能化中氮茚的新合成方法。在此反应中,2-(吡啶-2-基)乙酸酯衍生物和,-二亚甲基胺酮用作底物。所有这些过程都是通过在空气中在 I 存在下加热甲苯中的起始材料混合物来实现的。级联反应导致一锅中形成两个键并裂解一个键。因此,通过级联反应产生了许多官能化中氮茚。该方案可用于合成功能化不对称2,4-二芳基吡啶。此外,它适用于一锅反应中中氮茚衍生物的组合和平行合成,而不是繁琐的多步反应。