Reaction of Cyano Active Methylene Compounds with 2-Hydroxy-1-naphthal-4-acetylaniline: An Unexpected Result
作者:Ramandeep Kaur Mehton、M.R. Manrao
DOI:10.14233/ajchem.2017.20228
日期:——
Condensation of cyano active methylene compounds (1-5) with 2-hydroxy-1-naphthal-4-acetylaniline, the compound containing both carbon-nitrogen double bond as well as carbon-oxygen double bond, in equimolar ratio resulted in the formation of crude solids (1a-5a) which were crystallized from benzene. The products were characterized as 3-imino-3H-benzo[f]chromene derivatives (1a-5a) on the basis of elemental analysis and spectral studies. Reaction of compounds (1-5) with 2-hydroxy-1-naphthal-4-acetylaniline in 2:1 molar ratio also yielded the same products (1a-5a). Thus, cyano active methylene compounds reacted chemoselectively with carbon-nitrogen double bond of 2-hydroxy-1-naphthal-4-acetylaniline, leaving the carbon-oxygen double bond, considered to be more reactive, intact, leading to the formation of mono addition-elimination products which cyclized due to interaction between hydroxyl group and cyano group.
氰基活性甲基化合物(1-5)与含有碳-氮双键和碳-氧双键的2-羟基-1-萘-4-乙酰苯胺在等摩尔比下缩合,生成粗固体(1a-5a),这些固体从苯中结晶。产品根据元素分析和光谱研究被鉴定为3-亚氨基-3H-苯并[f]色烯衍生物(1a-5a)。化合物(1-5)与2-羟基-1-萘-4-乙酰苯胺在2:1摩尔比下的反应也产生了相同的产品(1a-5a)。因此,氰基活性甲基化合物选择性地与2-羟基-1-萘-4-乙酰苯胺的碳-氮双键反应,留下被认为更具反应性的碳-氧双键完整,导致形成单加成-消除产物,这些产物由于羟基和氰基之间的相互作用而环化。