The organocatalytic role of L-(+)-tartaric acid in the synthesis of 5-aryl-1,1′- and 5-aryl-3,1′-dimethyl-1H,1′H-spiro[furo[2,3-d]pyrimidine-6,5′-pyrimidine]2,2′,4,4′,6′(3H,3′H,5H)-pentaones
作者:Shahla Shahvirdi、Hamid Rashidnejad、Nader Noroozi Pesyan
DOI:10.1007/s13738-020-02041-7
日期:2021.2
barbiturate at the range of 0 °C to room temperature. In this reaction, L-(+)-TA acted as a sieve to reduce the number of diastereomeric products. Knoevenagel condensation and Michael adduct were the main processes involved in this reaction. The structure of compounds was investigated by 1H and 13C-NMR, and FTIR spectroscopy techniques.
1-甲基嘧啶-(1 H,3 H,5 H)-2,4,6-三酮(1-MBA 1a ')作为不对称巴比妥酸与溴化氰(BrCN)和各种醛的反应作为有机催化剂的L-(+)-酒石酸(L-(+)-TA)提供了杂环稳定的5-芳基-1,1'-二甲基-和5-芳基-3,1'-二甲基-1 H,1 ' ħ -螺[呋喃并[2,3- d ]嘧啶-6,5'-嘧啶] 2,2',4,4',6'(3 ħ,3' ħ,5 ħ)-戊酮,在0°C至室温下具有1-甲基巴比妥酸酯的二聚体形式。在该反应中,L-(+)-TA充当减少非对映体产物数量的筛子。Knoevenagel缩合反应和Michael加合物是该反应的主要过程。通过1 H和13 C-NMR和FTIR光谱技术研究化合物的结构。