Light-induced coumarin cyclopentannelation.


[reaction: see text] Whereas cyclopentenylcarbenes resulting from photocycloaddition of 4-alk-1-ynylcoumarins to 2,3-dimethylbut-2-ene undergo tandem cyclization to hitherto unknown tetracyclic (4-hetera)cyclopent[b,c]acenaphthylenes, the corresponding cyclopentenylnitrenes stemming from 4-cyanocoumarins and the same alkene are converted into tricyclic imines via H-abstraction.

Cite this paper

@article{Soltau2005LightinducedCC, title={Light-induced coumarin cyclopentannelation.}, author={Marko Soltau and Maren G{\"{o}wert and Paul Margaretha}, journal={Organic letters}, year={2005}, volume={7 23}, pages={5159-61} }