首页> 外文期刊>Journal of the Chemical Society, Perkin Transactions 1 >Intramolecular addition of acyldiazenecarboxylates onto double bonds in the synthesis of heterocycles
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Intramolecular addition of acyldiazenecarboxylates onto double bonds in the synthesis of heterocycles

机译:杂环合成中将酰基二氮烯羧酸酯分子内加成到双键上

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摘要

Appropriate aryl-substituted unsymmetrical azodicarbonyl compounds, generated from bishydrazides by oxidation,nundergo intramolecular cyclisations to furnish a variety of useful heterocycles such as N-substituted oxindoles,ncarbostyrils, benzazepinones, benzazocinones, benzimidazolones, benzoxazinones and pyrazolones in varyingndegrees of efficiency. Methods are described to remove the N-acyl groups from the heteroaromatic compounds.nUnder mildly acidic conditions where equal opportunities are available for an ipso or a normal cyclisation it is thenformer process that occurs preferentially. Evidence is presented in favour of a C-to-C migration in the ipso productnfor the formation of a methoxy-substituted carbostyril derivative. One of the spiro substances is shown to participatenin dienone–phenol rearrangement to provide the corresponding quinolone–phenol in high yield.
机译:由二肼通过氧化生成的合适的芳基取代的不对称偶氮二羰基化合物,经过分子内环化以提供各种有用的杂环,例如N-取代的羟吲哚,ncarbostyrils,苯并ze庚酮,苯并恶唑酮,苯并咪唑酮,苯并恶嗪酮和吡喃酮酮的效率。描述了从杂芳族化合物中除去N-酰基的方法。在中等酸性条件下,ipso或正常环化可利用的机会均等,这是优先发生的形成过程。证据表明,在ipso产品中C到C的迁移有助于形成甲氧基取代的卡斯丁尔衍生物。一种螺环物质被证明参与二烯酮-苯酚的重排,以高产率提供相应的喹诺酮-苯酚。

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