Regioselective ring expansion followed by H-shift of 3-ylidene oxindoles: a convenient synthesis of N-substituted/un-substituted pyrrolo[2,3-<i>c</i>] quinolines and marinoquinolines
and metal-free protocol for the synthesis of 4-oxo-4,5-dihydro-3H-pyrrolo[2,3-c]quinolines. The present method under mild reaction conditions with wide functional group compatibility gives several unexplored N-substituted/unsubstituted 4-oxo-4,5-dihydro-3H-pyrrolo[2,3-c]quinolines and marinoquinolines in good to excellent yields. Mechanistic insights for the synthesis of N-substituted pyrroloquinolines
在此,我们报告了一种用于合成 4-oxo-4,5-dihydro-3 H -pyrrolo[2,3 - c ] 喹啉的简单且无金属的方案。本方法在温和的反应条件下具有广泛的官能团相容性,以良好至优异的产率提供了几种未开发的 N-取代/未取代 4-oxo-4,5-dihydro-3 H -pyrrolo [2,3 - c ] 喹啉和 marinoquinolines。N-取代吡咯并喹啉合成的机理研究揭示了 3-亚基氧吲哚的扩环和 H 位移是关键步骤。
The first catalytic asymmetric exo′‐selective [3+2] cycloaddition of methyleneindolinones with iminoesters was achieved for construction of novel diastereomers of spiro[pyrrolidin‐3,3′‐oxindole]. By using the imidazoline–aminophenol‐ligand complex [Ni(OAc)2–(L1)], the reaction proceeds in the stepwise Michael–Mannich reaction to give the exo′ adducts as stable isomers (see scheme).
Regioselective Ring Expansion of 3-Ylideneoxindoles with Tosyldiazomethane (TsDAM): A Metal-Free and Greener Approach for the Synthesis of Pyrazolo-[1,5-<i>c</i>]quinazolines
An efficient, metal-free approach to access pyrazolo-[1,5-c]quinazolines with 3-ylideneoxindoles and tosyldiazomethane (TsDAM) under mild aqueous reaction conditions has been developed and the solvent involvement in the present reaction has also been explored for the first time. This greener approach involves 1,3-dipolar cycloaddition, regioselective ring expansion, followed by the elimination of tosyl
在温和的水性反应条件下,开发了一种高效,无金属的方法,可与3-亚硝基氧吲哚和甲苯磺酰重氮甲烷(TsDAM)接触吡唑并-[1,5- c ]喹唑啉,并探索了该反应中涉及的溶剂。第一次。这种更环保的方法涉及1,3-偶极环加成,区域选择性环扩环,然后在一次操作中用含水碱消除甲苯磺酰基,并且可以高纯度分离产物,而无需柱色谱分离。该方法还与多种官能团兼容,在水中提供了良好或优异的收率,从而减少了制药行业对环境的影响。
Copper(<scp>i</scp>)/Ganphos catalysis: enantioselective synthesis of diverse spirooxindoles using iminoesters and alkyl substituted methyleneindolinones
A copper-catalyzed asymmetric 1,3-dipolar cycloaddition of glycine iminoesters with alkyl substituted 3-methylene-2-oxindoles is described. By using de novo design of P-stereogenic phosphines as ligands, spiro[pyrrolidin-3,3'-oxindole]s are generated in good to excellent yields with high asymmetric induction. A further reduced catalyst loading of 0.1 mol% is sufficient to achieve a satisfactory enantioselectivity
Towards multi-target antidiabetic agents: In vitro and in vivo evaluation of 3,5-disubstituted indolin-2-one derivatives as novel α-glucosidase inhibitors
作者:Vladlen G. Klochkov、Elena N. Bezsonova、Meriam Dubar、Daria D. Melekhina、Victor V. Temnov、Ekaterina V. Zaryanova、Natalia A. Lozinskaya、Denis A. Babkov、Alexander A. Spasov
DOI:10.1016/j.bmcl.2021.128449
日期:2022.1
2-oxindole derivatives as GSK3β inhibitors with in vivo antihyperglycemic activity. α-Glucosidase is another antidiabetic target that prevents postprandial hyperglycemia and corresponding hyperinsulinemic response. Herein we report a study of 3,5-disubstituted indolin-2-one derivatives as potent α-glucosidaseinhibitors. These inhibitors were identified via efficient synthesis, in vitro screening,