Triethylamine → 3-[[3,5-bis[(tetrahydro-2H-pyran-2-yl)oxy]benzoyl]amino]-N-[2,6-dichloro-4-[[[(3-hydroxyphenyl)methyl]amino]carbonyl]benzoyl]-L-alanine, methyl ester

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Reaction Steps

A solution of 1-[[3,5-bis[(tetrahydro-2H-pyran-2-yl)oxy]benzoyl]oxy]-2,5-pyrrolidinedione (2.10 g, 5.0 mmol), 3-amino-N-[2,6-dichloro-4-[[[(3-hydroxyphenyl)methyl]amino]carbonyl]benzoyl]-L-alanine, methyl ester hydrochloride (Example 75; 2.00 g, 4.2 mmol), and triethylamine (500 mg, 4.9 mmol) in N,N-dimethylformamide (20 mL) was stirred at room temperature overnight. The solvent was evaporated and ethyl acetate (125 mmol) was added. The solution was washed with 0.2 M HCl (125 mL) and the aqueous wash was back-extracted with ethyl acetate (100 mL). The combined organic layers were washed with saturated aqueous sodium hydrogen carbonate and brine (30 mL each), evaporated, and chromatographed (50-100% ethyl acetate/hexanes) to give 3-[[3,5-bis[(tetrahydro-2H-pyran-2-yl)oxy]benzoyl]amino]-N-[2,6-dichloro-4-[[[(3-hydroxyphenyl)methyl]amino]-carbonyl]benzoyl]-L-alanine, methyl ester (1.61 g, 52%) as a white foam.

Provenance & Evidence