Competition between cyclisation and bisimine formation in the reaction of 1,3-diaminopropanes with aromatic aldehydes
作者:Julie M. Locke、Renate Griffith、Trevor D. Bailey、Robyn L. Crumbie
DOI:10.1016/j.tet.2009.10.060
日期:2009.12
Condensation of 1,3-diamines with aldehydes or ketones gives rise to two major products, the hexahydropyrimidine and the bisimine. Experimental studies of the reaction between a range of aromatic aldehydes and 1,3-diaminopropane or 1,3-diamino-2-propanol establish that the hexahydropyrimidine is favoured by the less nucleophilic amine and by the presence of electron withdrawing groups on the aryl ring
1,3-二胺与醛或酮的缩合产生两种主要产物,即六氢嘧啶和双亚胺。一系列芳族醛与1,3-二氨基丙烷或1,3-二氨基-2-丙醇之间反应的实验研究表明,六氢嘧啶受亲核性较弱的胺和芳环上存在吸电子基团的影响醛。计算表明该芳基环取代基的电子性质既影响最终产物的相对热力学稳定性,也影响醛作为亲电子试剂的反应性。