Heterodienophilic intramolecular diels-alder reactions of 1,2,4 triazines.
作者:Edward C. Taylor、Joseph L. Pont、John C. Warner
DOI:10.1016/s0040-4020(01)87691-2
日期:1987.1
7-(2'-cyanophenoxy)-6-azalumazines undergo intramolecularDiels-Alderreactions to yield novel polycyclic pyrazines and lumazines. However, the analogous 5-(2'-cyanophenoxy)-1,2,4-triazines fail to undergo cycloaddition, preventing access to the unknown benzfuro[2,3-]-1,2,4-triazine system. Substitution of oxime ethers for nitriles on the dienophilic sidechains of the respective Diels-Alder precursors failed to increase