Polysubstituted annulated pyridines were synthesized in high yields by four-component, one-pot cyclocondensation reactions of N-phenacylpyridinium bromide, aromatic aldehydes, acetophenones or cyclic ketones in the presence of ammonium acetate and acetic acid, assisted by microwave irradiation. In this procedure, cyclic ketones with two alpha-CH(2) groups yield annulated pyridines with additional alpha-benzylidene
描述了通过改良的Krohnke方法一锅有效地合成
吡啶。在微波辐射的辅助下,在
乙酸铵和
乙酸的存在下,通过N-苯甲酰
吡啶鎓
溴化物,芳族醛,
苯乙酮或环酮的四组分一锅环缩合反应,高收率地合成了多取代的环已
吡啶。在此过程中,具有两个α-CH(2)基团的环状酮会生成带有其他α-亚苄基的环式
吡啶,它们是从环状酮与两摩尔芳族醛的双羟醛缩合反应中原位获得的。