Diisopropylethylamine → 2-Chloro-4-[[[[3-[[(1,1-dimethylethyl)dimethylsilyl]oxy]phenyl]methyl]amino]carbonyl]-6-methylphenol

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Reaction Conditions

Reaction Steps

A suspension of 3-chloro-4-hydroxy-5-methylbenzoic acid (4.7 g, 25.2 mmol) in dichloromethane (50 mL) was cooled to 0° C. and BOP reagent (12.3 g, 27.8 mmol) was added, followed by diisopropylethylamine (13.2 mL, 75.6 mmol). A solution of 3-[[(1,1-dimethylethyl)dimethylsilyl]oxy]benzenemethanamine (Example 8; 6.59 g, 27.8 mmol) in dry dichloromethane (10 mL) was added by syringe and the resulting solution was stirred at ˜0° C. for 3 h. The solvent was evaporated and ethyl acetate (200 mL) was added. The solution was washed with 1 M HCl (2×50 mL), aqueous sodium hydrogen carbonate (100 mL), brine (100 mL), and water (100 mL)dried (MgSO4), filtered, evaporated, and chromatographed (30% ethyl acetate/hexanes) to give 2-chloro-4-[[[[3-[[(1,1-dimethylethyl)dimethylsilyl]oxy]phenyl]methyl]amino]carbonyl]-6-methylphenol (6.03 g, 59%) as a pale pink solid.

Provenance & Evidence