Affiliation:
1. School of Chemistry University of Bristol Cantock's Close BS8 1TS Bristol UK
2. Current address: Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Zhangjiang Institute for Advanced Study Shanghai Jiao Tong University No. 429, Zhangheng Road 200213 Shanghai China
3. Current address: National Key Laboratory of Green Pesticide College of Chemistry Central China Normal University (CCNU) 152 Luoyu Road 430079 Wuhan Hubei China
Abstract
AbstractDecarboxylative halogenation reactions of alkyl carboxylic acids are highly valuable reactions for the synthesis of structurally diverse alkyl halides. However, many reported protocols rely on stoichiometric strong oxidants or highly electrophilic halogenating agents. Herein, we describe visible‐light photoredox‐catalyzed decarboxylative halogenation reactions of N‐hydroxyphthalimide‐activated carboxylic acids that avoid stoichiometric oxidants and use inexpensive inorganic halide salts as the halogenating agents. Bromination with lithium bromide proceeds under simple, transition‐metal‐free conditions using an organic photoredox catalyst and no other additives, whereas dual photoredox‐copper catalysis is required for chlorination with lithium chloride. The mild conditions display excellent functional‐group tolerance, which is demonstrated through the transformation of a diverse range of structurally complex carboxylic acid containing natural products into the corresponding alkyl bromides and chlorides. In addition, we show the generality of the dual photoredox‐copper‐catalyzed decarboxylative functionalization with inorganic salts by extension to thiocyanation with potassium thiocyanide, which was applied to the synthesis of complex alkyl thiocyanates.
Funder
Engineering and Physical Sciences Research Council
EPSRC Centre for Doctoral Training in Technology Enhanced Chemical Synthesis
Subject
General Chemistry,Catalysis
Cited by
4 articles.
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