Photosensitized direct C-H fluorination and trifluoromethylation in organic synthesis

Tools

Yakubov, Shahboz and Barham, Joshua P. (2020) Photosensitized direct C-H fluorination and trifluoromethylation in organic synthesis. Beilstein Journal of Organic Chemistry, 16. pp. 2151-2192. ISSN 1860-5397 (https://doi.org/10.3762/bjoc.16.183)

[thumbnail of Yakubov-Barham-BJOC-2020-Photosensitized-direct-C-H-fluorination-and-trifluoromethylation]
Preview
 Text. Filename: Yakubov-Barham-BJOC-2020-Photosensitized-direct-C-H-fluorination-and-trifluoromethylation.pdf
Final Published Version
License: Creative Commons Attribution 4.0 logo
Download (3MB)| Preview

Abstract

The importance of fluorinated products in pharmaceutical and medicinal chemistry has necessitated the development of synthetic fluorination methods, of which direct C-H fluorination is among the most powerful. Despite the challenges and limitations associated with the direct fluorination of unactivated C-H bonds, appreciable advancements in manipulating the selectivity and reactivity have been made, especially via transition metal catalysis and photochemistry. Where transition metal catalysis provides one strategy for C-H bond activation, transition-metal-free photochemical C-H fluorination can provide a complementary selectivity via a radical mechanism that proceeds under milder conditions than thermal radical activation methods. One exciting development in C-F bond formation is the use of small-molecule photosensitizers, allowing the reactions i) to proceed under mild conditions, ii) to be user-friendly, iii) to be cost-effective and iv) to be more amenable to scalability than typical photoredox-catalyzed methods. In this review, we highlight photosensitized C-H fluorination as a recent strategy for the direct and remote activation of C-H (especially C(sp3)-H) bonds. To guide the readers, we present the developing mechanistic understandings of these reactions and exemplify concepts to assist the future planning of reactions.

ORCID iDs

Yakubov, Shahboz and Barham, Joshua P. ORCID logoORCID: https://orcid.org/0000-0003-1675-9399;
CORE (COnnecting REpositories)