We report the alkynylation of C(sp2)−H bonds with bromoalkynes (inverse-Sonogashira reaction) directed by synthetically useful ester, ketone, and ether groups under rhodium catalysis. Other less common directing groups such as amine, thioether, sulfoxide, sulfone, phenol ester, and carbamate are also suitable directing groups. Mechanistic studies indicate that the reaction proceeds by a turnover- limiting C−H activation step via an electrophilic-type substitution.
E. Tan, O. Quinonero, M.E. de Orbe, A.M. Echavarren
ACS Catal. 2018, 8, 2166-2172
DOI:
10.1021/acscatal.7b04395
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