Table 1.

Preparation of Potassium Alkoxymethyltrifluoroborates^a

entry	nucleophile	reaction time (h)	product		isolated yield (%)
1		3		2a	98
2		5		2b	97
3		11		2c	91b
4		7		2d	99
5		5		2e	75
6		24		2f	95
7		6		2g	86
8	MeONa	14		2h	91b
9		3		2i	84
10		5		2j	98
11		5		2k	92

^aConditions: ROH (3 equiv), NaH (3 equiv), THF (0.2 M), 0 °C–rt.

^bCommercially available alkoxide was used.