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)。
Novel Reaction of N,N'-Bisarylmethanediamines with Formaldehyde. Synthesis of Some New 1,3,5-Triaryl-1,3,5-hexahydrotriazines
作者:Mehdi Ghandi、Farshid Salimi、Abolfazl Olyaei
DOI:10.3390/11070556
日期:——
methanediamines 5a-c with aqueous formaldehyde in refluxing acetonitrile leads to the formation of the corresponding 1,3,5-triaryl-1,3,5-hexa-hydrotriazines 6a-c. The stoichiometric reactions of 2-aminopyrimidine and 2-amino-pyrazine with aqueous formaldehyde in acetonitrile under reflux conditions also afforded 6a and 6b, respectively. Treatment of 2-aminopyrimidine with aqueous formaldehyde in a 3:2 ratio yielded
Four‐Component Cyclocondensation of Aminodiazines, Glyoxal, Formaldehyde, and Methanol to Imidazolidines
作者:Mehdi Ghandi、Abolfazl Olyaei、Farshid Salimi
DOI:10.1080/00397910601033450
日期:2007.2.1
Four-component reaction of aminodiazines (2-aminopyrimidine and 2-aminopyrazine), glyoxal, formaldehyde, and methanol yields traps-4,5-dimetoxy1,3-bis(2-pyrimidinyl)imidazolidine (5a) and traps-4,5-dimetoxy-1,3-bis(2-pyrazinyl) imidazolidine (5b), respectively. Changing methanol to acetonitrile leads to the formation of the corresponding 1,3-bis(2-pyrimidinyl) and- 1,3-bis(2-pyrazinyl)derivatives of traps-4,5-dihydroxyimidazolidine (6). Details of the proposed mechanism are discussed.
Skowronska-Serafinowa, Roczniki Chemii, 1955, vol. 29, p. 932