Table 1.

Model Reaction and Optimization^a

entry	cat., mol %	solvent	time/temp	yield (%)b
1	DEU, 20	DMSO	2 h/rt	86
2	DEU, 20	DMSO	4 h/rt	>99 (91c)
3	DEU, 20	DMF	2 h/rt	63
4	DEU, 20	DMPU	2 h/rt	49
5	DEU, 30	otherd	16 h/60 °C	0
6	DEU, 10	DMSO	2 h/rt	75
7	DEU, 10	DMSO	24 h/rt	>99
8	DMPU, 130	DMSO	16 h/rt	73
9	–	DMSO	64 h/rt	7

^aConditions: 1a (0.5 M, 1 equiv), 2a (0.63 M). rt (≈22 °C).

^bDetermined by ¹⁹F NMR.

^cIsolated yield.

^dTHF, MeOH, acetone.