One-Pot stereoselective synthesis of<i>trans</i>-4,5-dialkoxy-1,3-bis (2-pyrimidinyl)imidazolidines through a three-component reaction
作者:Mehdi Ghandi、Farshid Salimi、Abolfazl Olyaei
DOI:10.1002/jhet.5570430342
日期:2006.5
Stoichiometric reaction of 2-aminopyrimidine with formaldehyde in the presence of formic acid catalyst in water gave N,N′-bis(2-pyrimidinyl)methanediamine (5). Subsequent cyclocondensation of 5 with glyoxal in alcohol (MeOH, EtOH, PrOH and i-PrOH) under reflux conditions led to the formation of the corresponding 4,5-dialkoxy-1,3-bis(2-pyrimidinyl)imidazolidines (6a-d). 4,5-Dihydroxy-1,3-bis(2-pyrimidinyl) imidazolidine
在水中存在甲酸催化剂的情况下,2-氨基嘧啶与甲醛的化学计量反应得到N,N'-双(2-嘧啶基)甲烷二胺(5)。随后在回流条件下将5与乙二醛在乙醇(MeOH,EtOH,PrOH和i -PrOH)中进行环缩合,导致形成相应的4,5-二烷氧基-1,3-双(2-嘧啶基)咪唑烷(6a-d)。当在乙腈中进行反应时,获得4,5-二羟基-1,3-双(2-嘧啶基)咪唑烷(6e)。根据1 H NMR分析,发现反式-二烷氧基咪唑烷(6在这些环缩合反应中有选择地获得)。