Synlett p. 129 - 133 (2008)
Update date:2022-08-04
Topics:
Gorobets, Evugeni
Parvez, Masood
Keay, Brian A.
A new synthetic method for the preparation of multisubstituted benzopyrans that involves an intramolecular conjugate addition of allyloxy anions to diphenylphosphinoyl-substituted benzene rings is described. The intermediate anion is trapped with electrophiles providing benzopyrans that are readily oxidized with O2 to intermediates containing a peroxide that is easily converted into benzopyran-2-ones (i.e. coumarins). Georg Thieme Verlag Stuttgart.
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