Strategies for the synthesis of azafenestradienes and azacyclooctatrienes
We have studied possibles access to two new molecular families that are azacyclooctatrienes and [6.4.6.4]azafenestradienes by using a new synthesis methodology : the 8π azaelectrocylization which, for now has never been described to our knowledge. After few synthetic steps initiated by the 4-exo-dig cyclocarbopalladation, we have obtained different key intermediates as azatrienynes and azatetraenes in order to study the feasibility of the azaelectrocyclization. The influence of differents parameters have been studied in particular the temperature, catalytic addition of transition metal and the introduction of an electron-withdrawing group in different position of the azocine skeleton. By this study, we established some useful parameters to continue the understanding of azaelectrocyclization feasibility.