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 ?-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.
Boettcher, Christoph,Zeyat, Gehad,Ahmed, Saleh A.,Irran, Elisabeth,Rueck-Braun, Karola,Cordes, Thorben,Elsner, Cord,Zinth, Wolfgang
supporting information; experimental part
(2010/04/22)
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