Yang, Kai Xiang, Jinbao Bao, Guochen Dang, Qun Bai, Xu Synthesis of Highly Substituted 4<i>H</i>‑Pyrido[1,2‑<i>a</i>]pyrimidines via a One-Pot Three-Component Condensation Reaction A one-pot three-component reaction, involving condensation of 2-aminopyridines, aldehydes, and ketones/aldehydes under trifluoromethanesulfonic acid catalysis, provides rapid access to highly substituted novel 4<i>H</i>-pyrido­[1,2-<i>a</i>]­pyrimidines. ReactionA;access;Substituted;aldehyde;Synthesi;Condensation;aminopyridine;condensation;ketone;trifluoromethanesulfonic acid catalysis 2013-09-09
    https://acs.figshare.com/articles/journal_contribution/Synthesis_of_Highly_Substituted_4_i_H_i_Pyrido_1_2_i_a_i_pyrimidines_via_a_One_Pot_Three_Component_Condensation_Reaction/2379187
10.1021/co400086u.s001