Table 1.

Optimization of reaction conditions

Entry	Cat (20 mol%)	Reagent	Oxidant	Solvent (1 mL/1 mL)	Yield (%)a
1	AgNO3	A	PIDA	CH3CN/H2O	Trace
2	AgNO3	A	Oxone	CH3CN/H2O	Trace
3	AgNO3	A	Na2S2O8	CH3CN/H2O	37
4	AgNO3	A	K2S2O8	CH3CN/H2O	40
5	AgNO3	A	K2S2O8	Acetone/H2O	55(71)b
6	–	A	K2S2O8	Acetone/H2O	n.d.
7	AgI	A	K2S2O8	Acetone/H2O	Trace
8	CuCl2	A	K2S2O8	Acetone/H2O	Trace
9	FeCl2	A	K2S2O8	Acetone/H2O	Trace
10	MnBr2	A	K2S2O8	Acetone/H2O	Trace
11	AgNO3	A	K2S2O8	PhCF3/H2O	n.d.
12	AgNO3	A	K2S2O8	DMSO/H2O	Trace
13	AgNO3	B	K2S2O8	Acetone/H2O	32
14	AgNO3	C	K2S2O8	Acetone/H2O	54
15	AgNO3	D	K2S2O8	Acetone/H2O	37

Reaction conditions: 1a (0.2 mmol), catalyst (0.04 mmol), oxidant (0.3 mmol), reagent (0.4 mmol), solvent (2 mL), stirred at 50 °C under Ar (1 atm) for 24 h

^aIsolated yield

^bYield based on recovered alcohols