In conclusion, a metal-free photocatalyzed lactonizationalkynylation reaction of homoallylic cesium oxalates has been developed. In addition to valuable spirolactones, bicyclic compounds and substituted lactones and lactams were also obtained. Moreover, various halogenated-and electron-donating or -withdrawing groups containing EBX reagents were successfully used in the reaction. Finally, the synthetic utility of the obtained compounds was demonstrated by transforming the alkyne into a carboxylic acid and reducing the lactones to 1,4-diols.