Pyrrolocoumarin derivatives as potential photoreagents toward DNA.

A number of new methyl derivatives of linear and angular pyrrolocoumarins were synthesized by direct Fischer\u2019s indole synthesis. In the same way some linear and angular pyranocarbazolones. The synthesis were performed starting from the appropriate methyl-7-aminocoumarins and methyl groups were introduced into positions which look most promising for the photoreactivity toward DNA