The present invention relates to a compound of formula (I)
as well as pharmaceutically acceptable salt thereof, wherein R
1
to R
4
have the significance given in claim
1
. The compound may be used, for example, for the treatment or prophylaxis of obesity, hyperglycemia, dyslipidemia, and type 1 or type 2 diabetes,
A new, simple and efficient one-pot three-component synthesis of oxindole derivatives has been developed by the reaction of phthalhydrazide, aldehydes and indoline-2-one under reflux conditions. This protocol avoids the use of expensive catalysts, toxic solvents and chromatographic techniques. Excellent yields, shorter reaction time, readily available starting materials and mild reaction condition
通过邻苯二甲酰肼、醛类和二氢吲哚-2-酮在回流条件下的反应,开发了一种新的、简单、高效的一锅法合成羟吲哚衍生物的方法。该协议避免使用昂贵的催化剂、有毒溶剂和色谱技术。该方法具有收率高、反应时间短、原料易得、反应条件温和等优点。所有合成的化合物均通过1 H NMR、13 C NMR和质谱进行表征。
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).