Table 1.

Optimization studies^a.

Entry	Solvent	Time (h)	Yield (%)b
1	CH3CN	12	45
2	CH3CN	24	59
3	CH3CN	36	59
4	DCE	24	31
5	dioxane	24	57
6	DMF	24	trace
7	DMSO	24	trace
8	toluene	24	72
9c	toluene	24	51
10d	toluene	24	86
11e	toluene	24	86

^aUnless otherwise specified, all reactions were carried out on 1a 0.5 mmol scale, iodine 1.0 equiv, tert-butyl hydroperoxide (TBHP) 2.0 equiv, solvent 2.0 mL; ^byield calculated by GC; ^cI₂: 0.5 equiv; ^dTBHP: 3.0 equiv; ^eTBHP: 4.0 equiv.