作者:Gunther R. Pabst、Jürgen Sauer
DOI:10.1016/s0040-4039(98)01437-3
日期:1998.9
α-arylglyoxals with carboxamidrazones 1 – 2 is the best method for the synthesis of aryl or hetaryl substituted 1,2,4-triazines 3 – 4. These 1,2,4-triazines can be easily transformed to pyridines by [4+2] cycloaddition with bicyclo[2.2.1]hepta-2,5-diene followed by [4+2] cycloreversions of nitrogen and cyclopentadiene. This reaction sequence offers a new, simple and general access to 2,6-oligopyridines 8 – 11.
α-与芳基乙二醛的carboxamidrazones缩合1 - 2为芳基或杂芳基的合成的最佳方法取代的1,2,4-三嗪-3 - 4。通过与双环[2.2.1]庚-2,5-二烯进行[4 + 2]环加成,然后对氮和环戊二烯进行[4 + 2]环还原,可以轻松地将这些1,2,4-三嗪转化为吡啶。该反应顺序提供了一个新的,简单和通用访问2,6- oligopyridines 8 - 11。