作者:Gunther R. Pabst、Konrad Schmid、Jürgen Sauer
DOI:10.1016/s0040-4039(98)01438-5
日期:1998.9
2-dicarbonyl compounds 2 is the best method for the synthesis of alkyl, aryl or hetaryl substituted 1,2,4-triazines 3 – 7. These 1,2,4-triazines can be easily transformed to pyridines 8 – 12 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 branched oligopyridines
羧酰胺dra 1与1,2-二羰基化合物2的缩合是合成烷基,芳基或杂芳基取代的1,2,4-三嗪3-7的最佳方法。通过与双环[2.2.1]庚-2,5-二烯进行[4 + 2]环加成,然后进行氮和环戊二烯的[4 + 2]环还原,可以轻松地将这些1,2,4-三嗪转化为吡啶8-12。该反应序列为分支的寡吡啶提供了新的,简单的通用途径。