摘要:
A new synthesis route to firefly luciferin analogs was developed via the synthesis of 50,70-difluoroluciferin. As a luciferase substrate, it produces maximal bioluminescence at a much lower pH than is optimal for native luciferin, and at lower pH it gives much more of the red-shifted emission that is characteristic of the phenolate. These features are attributed to the enhanced acidity of the o,o-difluorophenol. (C) 2014 Elsevier Ltd. All rights reserved.