General Procedure for the Photocatalytic Vinylation: A 8 mL screw cap vial was charged with DHP 1 (0.2 mmol, 1.0 equiv), VBX 2 (2.0 equiv), 4CzPN (1 mol %) and NaOAc (1.0 equiv). The vial was sealed with a teflon cap, put under vacuum for 15 minutes and then purged with argon. Degassed MeCN/H2O (4:1, 0.1 M) was then added. The solution was degassed by freeze-pumpthaw (3 cycles), then the vial was filled with argon. The vial was irradiated with blue LEDs and stirred for 36 h with a cooling fan placed on top of the setup. After completion of the reaction, the mixture was concentrated in vacuo and purified by column chromatography to obtain product 3.