Synthesis and Functionalization of 3-Azolylquinoxalin-2(1H)-ones
摘要:
Ethyl 2-azolylglyoxylates react smoothly with o-phenylenediamines and 1,2-diaminocyclohexane in acetonitrile at room temperature to give the corresponding 3-azolylquinoxalin-2(1H)-ones and their saturated analogues in good to excellent yields.
C-Acylation of N-substituted imidazoles with ethyl oxalyl chloride in the presence of N,N-diisopropylethylamine as a base afforded 2-(2-ethoxy-1,2-dioxoethyl)imidazoles in 83-95% yield. Application of this synthetic protocol to thiazoles and triazoles led to the corresponding 2-ethoxy-1,2-dioxoethyl derivatives in 40-51% yield.
Ethyl 2-azolylglyoxylates react smoothly with o-phenylenediamines and 1,2-diaminocyclohexane in acetonitrile at room temperature to give the corresponding 3-azolylquinoxalin-2(1H)-ones and their saturated analogues in good to excellent yields.