2-Isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane → 5-(Cyclopropylmethoxy)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,3-benzodioxole

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Reaction Steps

A stirred solution of 5-cyclopropylmethoxy-benzo[1,3]dioxole from example B.b1 (38.44 g; 200.0 mmol) in dry THF (500 mL) is cooled to −40° C. before n-butyl lithium (138.0 mL; 1.6 M solution in hexane; 220 mmol) is slowly added via syringe. After complete addition, stirring is continued at −40° C. for two hours. At −78° C. neat 2-iso-propoxy-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane (40.95 g; 220.0 mmol) is added via syringe and stirring is continued at −78° C. for two hours.

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