Reactions of 2-acyl-1,3-indandiones with nitrogen nucleophiles were studied rarely. The question, if they react with carbonyl carbon of acyl group or indandione skeleton, has not been answered unambiguously. To make clear the question which carbonyl carbon of 2-acyl-1,3-indandiones enters the reaction with nitrogen nucleophiles we carried out the reactions with 2-acetyl- (Ia), 2-propionyl- (Ib), 2-pivaloyl- (Ic), and 2-benzoyl-1,3-indandione (Id). We used different 2-acyl-1,3-indandiones with the aim to find out if the character of acyl group affects the course of reaction. We used ethoxyamine, primary amines, phenylhydrazine, hydrazine and methylhydrazine as nucleophile reactants. The reactions were carried out in methanol at reflux at 10% excess of nitrogen base. The reactions with phenylhydrazine, hydrazine and methylhydrazine were performed with twofold excess of nitrogen base. The separation of reaction products was carried out by chromatography on silica gel. We found that 2-acyl-1,3-indandiones I react with ethoxyamine both at the acylcarbonyl carbon to produce 2-(1-ethoxyiminoalkyl)-1,3-indandiones II and the carbonyl carbon of indandione skeleton to give rise 3-(ethoxyimino)-2-acyl-1-indanones III. In all cases, the carbonyl carbon of acyl group was preferred (the observed ratio of products II to III was 6 - 8 : 1). From the reaction of 2-acyl-1,3-indandiones with primary amines only the products IV of reaction with the acylcarbonyl carbon were isolated. The hydrazines used reacted with 2-acyl-1,3-indandiones also at carbonyl carbon of acyl group in the first step to produce hydrazones. However, the products isolated in most cases were formed by the attack of hydrazone nitrogen at carbonyl carbon of indandione skeleton giving rise to derivatives of indeno[2,3-d]pyrazole-4-one V. It is interesting that 2-acetyl-1,3-indandione and 2-propionyl-1,3-indandione, reacting with phenylhydrazine and hydrazine, yielded only corresponding hydrazones VI.
2-酰基-1,3-茚酮与氮亲核试剂的反应很少被研究。问题是,它们是与酰基羰基还是茚酮骨架上的羰基碳反应,尚未明确回答。为了澄清2-酰基-1,3-茚酮的哪个酰基碳与氮亲核试剂进入反应,我们进行了与2-乙酰-(Ia)、2-丙酰-(Ib)、2-戊酰-(Ic)和2-苯甲酰-1,3-茚酮(Id)的反应。我们使用不同的2-酰基-1,3-茚酮,旨在找出酰基群的性质是否影响反应的过程。我们使用乙氧胺、一级胺、苯基肼、肼和甲基肼作为亲核试剂。反应在甲醇中以10%的氮碱过量进行。苯基肼、肼和甲基肼的反应是在氮碱的两倍过量下进行的。反应产物的分离是通过硅胶色谱法进行的。我们发现,2-酰基-1,3-茚酮I与乙氧胺反应,既在酰基羰基碳上产生2-(1-乙氧亚胺烷基)-1,3-茚酮II,又在茚酮骨架的羰基碳上产生3-(乙氧亚胺)-2-酰基-1-茚酮III。在所有情况下,酰基羰基碳被优先选择(观察到的产物II与III的比例为6-8:1)。从2-酰基-1,3-茚酮与一级胺的反应中,只分离出与酰基羰基碳反应的产物IV。使用的肼也在首步与2-酰基-1,3-茚酮的酰基羰基碳反应,产生肼酮。然而,在大多数情况下,分离出的产物是由肼酮氮原子攻击茚酮骨架的羰基碳形成的,形成吲哚[2,3-d]吡唑-4-酮衍生物V。有趣的是,2-乙酰-1,3-茚酮和2-丙酰-1,3-茚酮与苯基肼和肼反应,只产生相应的肼酮VI。