Solvent-free Mannich-type reaction of tetraazatricyclododecane (TATD) with phenols
作者:Augusto Rivera、Rodolfo Quevedo
DOI:10.1016/j.tetlet.2012.12.116
日期:2013.3
and weakly activated rings form Mannich bases consisting of 1,3-bis[2′-hydroxybenzyl]imidazolidine. When the reaction is conducted using β-naphthol, a Mannich-type reaction occurs followed by a retro-Mannich-type reaction that forms 1,1′-methylene-bis(2-naphthol). The solvent-free reaction between 1,3-bis[2′-hydroxybenzyl]imidazolidine Mannich bases and the macrocyclic aminal 1,3,6,8-tetraazatricyclo[4
大环氨基1,3,6,8-四氮杂三环[4.4.1.1 3,8 ]十二烷(TATD)与酚之间的无溶剂曼尼希型反应表明,芳环的活化对于控制反应进程至关重要。活化环形成N,N'-双(2-羟基苄基)乙二胺(四氢盐),弱活化环形成曼尼希碱,该碱由1,3-双[2'-羟基苄基]咪唑烷组成。当使用β-萘酚进行反应时,发生曼尼希型反应,随后发生逆曼尼希型反应,形成1,1'-亚甲基-双(2-萘酚)。1,3-双[2'-羟基苄基]咪唑烷曼尼希碱与大环胺基1,3,6,8-四氮杂三环[4.4.1.1 3,8 ]之间的无溶剂反应十二烷(TATD)允许以受控方式获得高分子量的曼尼希碱。