Synthesis of novel photochromic pyrans via palladium-mediated reactions.
Photochromic pyrans for applications in material and life sciences were synthesized via palladium-mediated cyanation, carbonylation and Sonogashira cross-coupling starting from bromo-substituted naphthopyran 1 and benzopyrans 2a/b. A novel photoswitchable benzopyran-based omega-amino acid 6 for Fmoc-based solid-phase peptide synthesis is presented. The photochromic behaviour of the 3-cyano-substituted benzopyran 5a was investigated by time-resolved absorption spectroscopy in the picosecond time domain.
Böttcher
Christoph
C
Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany.
Zeyat
Gehad
G
Ahmed
Saleh A
SA
Irran
Elisabeth
E
Cordes
Thorben
T
Elsner
Cord
C
Zinth
Wolfgang
W
Rueck-Braun
Karola
K