Table 1. Control Reactions Describing Deviation from Standard Conditions Using Catalytic Copper and TDG^a.

entry	deviation from standard conditions	yield of compound 3aa (%)b
1	none	67 (68)
2	no [Cu]	0
3	no MnO2	17
4	no TDG	15
5	using TDG1	5
6	using TDG2	0
7	using TDG3	43
8	K2S2O8 as an oxidant (2–10 equiv)	11–21
9	+ K2CO3 (2 equiv)	70 (68)
10	+ TEMPO (1 equiv)	0

^aReactions were performed on a 0.2 mmol scale with respect to the sulfinate salt.

^bYields were determined by ¹H NMR using 1,3,5-trimethoxybenzene as an internal standard. Isolated yields are in parentheses. The starting material is volatile; therefore, recovered starting material was not reliably determined.