2-(4-{3-[1-(3,4-Dimethyl-benzyl)-2,5-dioxo-imidazolidin-4-yl]-propyl}-phenoxy)-2-methyl-propionic acid tert-butyl ester → 2-(4-{3-[1-(3,4-Dimethyl-benzyl)-2-oxo-imidazolidin-4-yl]-propyl}-phenoxy)-2-methyl-propionic acid tert-butyl ester

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A solution of 2-(4-{3-[1-(3,4-dimethyl-benzyl)-2,5-dioxo-imidazolidin-4-yl]-propyl}-phenoxy)-2-methyl-propionic acid tert-butyl ester (0.113 g, 0.228 mmol) in THF (6 mL) was treated dropwise with 1 M solution of borane-THF complex in THF (4.4 mL, 4.4 mmol) and then stirred at room temperature under N2 for 32 h. The reaction was quenched with methanol (6 mL) and stirred at room temperature for 2 hr. The solvent was removed in vacuo to give crude product that was purified by flash chromatography using 97:3 CH2Cl2:MeOH to afford 0.051 g (47%) 2-(4-{3-[1-(3,4-dimethyl-benzyl)-2-oxo-imidazolidin-4-yl]-propyl}-phenoxy)-2-methyl-propionic acid tert-butyl ester. MS (ES+) Calc'd for C29H41N2O4 (M+1) 481. Found m/z 481 (100%). 1H NMR.

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