Four‐Component Cyclocondensation of Aminodiazines, Glyoxal, Formaldehyde, and Methanol to Imidazolidines
摘要:
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.
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