Hexane → 1-(1,1-Dimethylethyl) 2-(phenylmethyl) 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrrole-1,2-dicarboxylate

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Reaction Steps

At −78° C. to a solution of 2-benzyl 1-tert-butyl 4-iodo-1H-pyrrole-1,2-dicarboxylate (10.0 g, 23.4 mmol), and 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (9.6 mL, 47 mmol) in THF (120 mL) was added dropwise a solution of 2.5 M n-butyllithium in hexane (11.2 mL, 28.1 mmol) with stirring. After completion of addition the mixture was stirred at this temperature for 35 min and then 2.5 M n-butyllithium in hexane (1.87 mL, 4.68 mmol) was added and stirred for another 30 minutes. The reaction was quenched with sat. NH4Cl solution and then diluted with EtOAc. The organic layer was separated, washed with water twice, washed with brine, dried over Na2SO4, and concentrated under reduced pressure. The product was isolated by chromatography eluting with 0 to 10% EtOAc in hexanes. LCMS calculated for C19H23BNO6 (M−[tBu+1]+1)+: m/z=372.2. found: 372.2.

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