The reaction of some enammes with N-substituted 3-oxindolideneacetophenones has been investigated. When the oxindole N-substituent is an acyl group, 1,4-cycloaddition occurs leading to 2,3-dihydropyrano[2,3-b]indole derivatives: when the N-substituent is an alkyl group, 1,2-cycloaddition takes place and spirocyclobutanoxindole derivatives are formed. Some intermediate cases are also presented. A possible
已经研究了某些酶与N-取代的3-氧代吲哚烯乙酮的反应。当羟吲哚N-取代基为酰基时,发生1,4-环加成反应,生成2,3-二氢吡喃并[2,3- b ]吲哚衍生物:当N-取代基为烷基时,1,2-环加成反应形成螺环丁二烯衍生物。还介绍了一些中间情况。提出了可能的合理化反应路径上的电子效应N-取代基的方法。
An easy lewis acid-mediated isomerization from (E)- to (Z)-Oxoindolin-3-ylidene ketones.
(E)-2-Oxoindolin-3-ylidene ketones can be easily isomerized to their (Z)-isomers by AlCl3 at room temperature in CH2Cl2. The behaviour of the unsaturated dicarbonyl framework in the (Z)-configuration as a bidentate ligand can be the key-step of the isomerization. The limits of a reaction that allows to prepare several yet-unknown products is discussed.