Entry

Catalyst (mol%)

Oxidant (equiv.)

Solvent

Yield (%)^b

1

4-DMAP (20)

TBHP (2)

Acetonitrile

38

2

4-DMAP (20)

TBHP (2)

Methyl alcohol

45

3

4-DMAP (20)

TBHP (2)

Dichloromethane

62

4

4-DMAP (20)

TBHP (2)

Ethyl acetate

41

5

2-DMAP (20)

TBHP (2)

Dichloromethane

78

6

2-DMAP (20)

H₂O₂ (2)

Dichloromethane

90

7

2-DMAP (20)

TBPB (2)

Dichloromethane

39

8

2-DMAP (20)

DTBP (2)

Dichloromethane

43

9

2-DMAP (20)

(NH₄)₂S₂O₈ (2)

Dichloromethane

82

10

2-DMAP (20)

K₂S₂O₈ (2)

Dichloromethane

41