Reaction optimization studies.

Entrya	Oxime	Temp./hv	Base	Time	Yieldb 8a/%
1	9a	30 °C	KOt-Bu	16 h	52
2	9b	30 °C	KOt-Bu	16 h	45
3	9c	30 °C	KOt-Bu	16 h	38
4	9d	30 °C	KOt-Bu	16 h	75
5	9d	30 °C	KOH	16 h	38
6	9d	30 °C	Cs2CO3	16 h	25
7c	9d	450 nm	KOt-Bu	1 h	65
8d	9d	30 °C	KOt-Bu	1 h	38
9	9d	30 °C	KOt-Bu	1 h	44
10e	9d	30 °C	KOt-Bu	16 h	10
11f	9d	30 °C	KOt-Bu	16 h	<5
12g	9d	30 °C	KOt-Bu	16 h	49

^aReactions performed with 0.1 mmol of aryl bromide 3aBr and 0.2 mmol oxime 9a–d with the stated base (0.2 mmol) in DMSO (0.5 mL) under nitrogen.

^bDetermined by ¹H NMR spectroscopy against an internal standard (dibromomethane).

^cUnder irradiation with 18 W blue LEDs (λ_max = 450 nm) and fan cooling.

^dReaction performed in the dark.

^eReaction performed in the presence of galvinoxyl (1 equiv.).

^fReaction performed in the presence of DPPH (1 equiv.).

^gReaction performed in the presence of TEMPO (2 equiv.).