Table 1.

Precatalyst screening.^[a]

[a] Reaction conditions: 0.5 mol % precatalyst (5 μmol), KO^tBu (1 mmol, 112 mg), A1 (1 mmol, 121 μL), MeOH (3 mmol, 122 μL), diglyme (2 mL), 140 °C (oil bath), 20 h. Yields of B1 and C1 were determined by GC‐analysis using n‐decane as an internal standard.