Effects of reaction parameters^a.

Entry	Variation from the standard conditions	3aa yieldb
1	None	83% (82%)c
2	HFIP instead of HFIP/CH2Cl2 (6 : 4)	76%
3	CF3CH2OH instead of HFIP	65%
4	(CH3)2CHOH instead of HFIP	9%
5	n-Bu4NPF6 instead of n-Bu4NBF4	58%
6	Platinum plate cathode instead of graphite rod cathode	88%c
7	Under air	80%c
8	No electric current	NR

^aReaction conditions: graphite rod anode, graphite rod cathode, constant current = 10 mA. 2a (0.3–0.4 mmol), 1a (1.5 equiv.), n-Bu₄NBF₄ (1.0 equiv.), solvent (10 mL), rt, 2 h, under N₂.

^bNMR yields using 1,1,2,2-tetrachloroethane as the internal standard.

^cIsolated yield.