A facile and diverse synthesis of coumarin substituted spirooxindole and dispiro oxindole-pyrrolizidine/pyrrolothiazole/pyrrolidine derivatives via 1, 3-dipolar cycloaddition
A diverse series of coumarin substituted spirooxindole and dispirooxindole-pyrrolizidine/pyrrolothiazole/pyrrolidinederivatives have been obtained via azomethineylide specific three-component 1,3-dipolarcycloadditionreaction. This protocol features include operational simplicity, mild reaction conditions, high yields and a broad substrate scope.
An efficient and chemoselective synthesis of biologically valuable chromeno[3,4-c]pyrrole 2-oxides containing one chiral stereocenter is described. In this method, by using a sequential nucleophilic addition reaction involving coumarins (α,β-unsaturated coumarins or 3-acetylcoumarins), activated acetylenic compounds, triphenylphosphine as a catalyst, and hydroxylammonium chloride (HAC) as an NO source
描述了一种含有一个手性立体中心的、具有生物价值的色并[3,4- c ]吡咯2-氧化物的有效化学选择性合成方法。该方法以香豆素(α,β-不饱和香豆素或3-乙酰香豆素)、活化炔属化合物、三苯基膦为催化剂、氯化羟铵(HAC)为NO源,通过连续亲核加成反应,合成取代色烯[3]。 ,4- c]吡咯2-氧化物的制备具有优异的效率。易得的起始原料、不含金属催化剂、绿色温和的条件、化学选择性、易于纯化(产物可以通过简单的过滤和乙醇洗涤来纯化)以及合成上有用的产率是这一前所未有的转变的一些突出优点。
Cross-aldol reaction of 3-acetyl-2H-chromen-2-one by using Amberlyst 26A as catalyst
作者:Mehmet Erşatır、Dilek Akbaşlar、Onur Demirkol、E. Sultan Giray
DOI:10.1080/00397911.2016.1252047
日期:2017.1.2
Synthesis of a series of 3-acetylcoumarin-derived chalcones (1a-16a) was catalyzed with Amberlyst 26A in ethanol. Using reusable Amberlyst 26A and biobased solvent ethanol make this method highly ecofriendly and simple. Amberlyst 26A was found to be a highly effective catalyst for cross aldol reaction. The results shown that the method is operationally simple to implement with a wide scope of substrates.[GRAPHICS].
Miky, J. A. A.; Farrag, A. A., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1997, vol. 36, # 4, p. 357 - 360
作者:Miky, J. A. A.、Farrag, A. A.
DOI:——
日期:——
DIMITROVA E.; ANGHELOVA Y., SYNTH. COMMUN., 16,(1986) N 10, 1195-1205