Trimethyl borate → 3-(1-Methyl-3-pentylureido)phenylboronic acid

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In a manner similar to that of Example (18a), by reaction of 123 g (0.411 mol, 1 eq) of 1-(3-bromophenyl)-1-methyl-3-pentylurea in 1.23 L of tetrahydrofuran, 150 mL (0.452 mol, 1.1 eq) of methyllithium, 530 mL (0.904 mol, 2.2 eq) of a 1.7 M solution of tert-butyllithium in pentane and 115 mL (0.904 mol, 2.2 eq) of trimethyl borate, and after purification by chromatography on silica gel (50/50 heptane/ethyl acetate) and crystallization from ethyl acetate/heptane, 42.0 g of 3-(1-methyl-3-pentylureido)phenylboronic acid are obtained in the form of a pink-colored powder. Yield=39%

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