Heteroannulation of 3-Bis(methylthio)acrolein with Aromatic Amines - A Convenient Highly Regioselective Synthesis of 2-(Methylthio)quinolines and their Benzo/Hetero Fused Analogs - A Modified Skraup Quinoline Synthesis
作者:Hiriyakkanavar Ila、Hiriyakkanavar Junjappa、Kausik Panda、Iffat Siddiqui、Pranab K. Mahata
DOI:10.1055/s-2004-815400
日期:——
synthesis of 2-(methylthio)quinolines and their condensed analogs has been developed through acid-induced cyclocondensation of their respective anilines or aromatic diamines with 3-bis(methylthio)acrolein. The 2-(methylthio) functionality in these quinolines could be either dethiomethylated or replaced by various nitrogen and carbon nucleophiles to afford 2-substituted quinolines.
A new one-pot, three-component synthesis of 2,3,5-substituted (or 2,3 -annulated)-6-(methylthio)pyridines by reacting acyclic or cyclic active methylene ketones, ammonium acetate, and bis(methylthio)acrolein (1) or its 2-phenyl analogue 8 (as 3-carbon-1,3-biselectrophilic components) in the presence of either AcOH-TFA (4:1) or ZnBr 2 (or Znl 2 ) catalysts has been reported.
The Proton Sponge Effect: Substitution of Quino[7,8-<i>h</i>]quinoline and the First Structurally Characterised Derivatives
作者:Karl J. Shaffer、Daniel C. Parr、Marco Wenzel、Gareth J. Rowlands、Paul G. Plieger
DOI:10.1002/ejoc.201201131
日期:2012.12
A new route to unsymmetrical derivatives of quino[7,8-h]quinoline was developed. Substitutions at the 2,11-, 4,9- and 6,7-positions of quino[7,8-h]quinoline were also successfully performed. X-ray crystal structure determinations of the resulting products revealed the propensity for derivatives of this molecule to exist in either stabilised keto or imino forms as a result of the formation of a strong
开发了不对称衍生物的喹诺[7,8-h] 喹啉的新途径。2,11-、4,9- 和 6,7- quino[7,8-h] 喹啉的取代也成功进行。所得产物的 X 射线晶体结构测定表明,由于形成了强大的分子内 N-H…N 氢键,该分子的衍生物倾向于以稳定的酮或亚氨基形式存在。