. 2023 Jun 22;88(13):9130–9135. doi: 10.1021/acs.joc.3c00761

Table 3. Yield and Regioselectivity of Sodium Tetrakis(pyrazolyl)Borates (4a–f_Na)^a.

Pyrazole	R³	R⁴	R⁵	Tkp^xNa (4_Na) Yield (%)^b
1a	tBu	H	H	73
1b	tBu	Br	H	64
1c	tBu	NO₂	H	91
1f	Ms	Br	H	93

Reaction conditions: 1a–f (4.1 mmol), NaH (4.1 mmol), toluene (15 mL) 30 min at 0 °C, BCl₃·SMe₂ (1 mmol) 24 h at rt.

Isolated yield.

Table 3. Yield and Regioselectivity of Sodium Tetrakis(pyrazolyl)Borates (4a–fNa)a.