Zusammenfassung
We report a mild method for the decarboxylative C-C bond formation between natural carboxylic acids and alkynes. Activation of a very broad scope of carboxylic acids derived from renewable resources is achieved by esterification to N (acyloxy)phthalimides. The cross coupling with acetylenic sulfones proceeds under irradiation with green light (528 nm) in the presence of the organic photocatalyst ...
Zusammenfassung
We report a mild method for the decarboxylative C-C bond formation between natural carboxylic acids and alkynes. Activation of a very broad scope of carboxylic acids derived from renewable resources is achieved by esterification to N (acyloxy)phthalimides. The cross coupling with acetylenic sulfones proceeds under irradiation with green light (528 nm) in the presence of the organic photocatalyst eosin Y and provides a metal-free, environmentally friendly and inexpensive alternative to known decarboxylative alkynylations.