Scheme 2. Regioselective Borylation of Spirocyclobutenes,
Reaction conditions: 1 (0.2 mmol), B2pin2 (0.22 mmol), KOt-Bu (0.5 equiv), CuCl (10 mol %), xantphos (11 mol %), MeOH (0.4 mmol), and THF (0.2 M).
Isolated yields.
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