Synthesis of 2,3,6-trisubstituted pyridines by transition-metal free cyclization of 1,3-diynes with amino acids
作者:Gang Zhou、Xiaoming Zhao、Wenyan Dan
DOI:10.1016/j.tetlet.2017.06.080
日期:2017.8
Amino acids are firstly employed in transition-metal free heterocyclization reaction of 1,3-diynes in the presence of K3PO4 and DMSO at 120 °C. This method produces 2,3,6-trisubstituted pyridines with up to 86% yield. The –CO2H group on the amino acids is crucial for this heterocyclization reaction. The mechanism of such a heterocyclization reaction is discussed, as well.
首先在120°C下在K 3 PO 4和DMSO存在下,将氨基酸用于1,3-二炔的无过渡金属的杂环反应中。该方法产生2,3,6-三取代的吡啶,产率高达86%。氨基酸上的–CO 2 H基团对于该杂环化反应至关重要。还讨论了这种杂环化反应的机理。