The chemical modification of trioxsalen using electrophilic aromatic
substitution reactions, followed by either Wittig or Heck reactions
or Suzuki coupling, allowed for ready access to C4′ modified
trioxsalen derivatives that were successfully used for the preparation
of a variety of trioxsalen conjugates with acitretin of either the
polyamine or the ester type and trioxsalen-acitretin hybrids.
electrophilic aromatic substitution - Heck reaction - psoralen-retinoid conjugation - Suzuki coupling - Wittig reaction