Acyl radical to rhodacycle addition and cyclization relay to access butterfly flavylium fluorophores.

Abstract:

:Transition metal-catalyzed C-H activation and radical reactions are two versatile strategies to construct diverse organic skeletons. Here we show the construction of a class of flavylium fluorophores via the merge of radical chemistry and C-H activation starting from (hetero)aryl ketones and alkynes. This protocol is not only applicable to aryl ketones but also to heteroaryl ketones such as thiophene, benzothiophene and benzofuran, thus leading to structural diversity. Mechanism studies, including control experiments, intermediate separation, radical trapping, EPR and ESI-HRMS experiments, demonstrate that the key step lies in the addition of the acyl radical generated by the copper-catalyzed C-C bond cleavage of aryl ketone to the rhodacycle formed via the C-H activation of aryl ketone. The flavylium fluorophores feature butterfly symmetrical configuration, nearly planar skeleton and delocalized positive charge, and exhibit intriguing photophysical properties, such as tunable absorption and emission wavelengths and high quantum yields.

journal_name

Nat Commun

journal_title

Nature communications

authors

Yin J,Zhang Y,Li J,Zhu L,Lan Y,You J

doi

10.1038/s41467-019-13611-6

subject

Has Abstract

pub_date

2019-12-11 00:00:00

pages

5664

issue

1

issn

2041-1723

pii

10.1038/s41467-019-13611-6

journal_volume

10

pub_type

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