Diisopropylethylamine → methyl (1S)-1-[({(1S,3S,4S)-3-hydroxy-4-[((2S)-3-methyl-2-{3-[(6-methyl-2-pyridinyl)methyl]-2-oxo-1-imidazolidinyl}pentanoyl)amino]-5-phenyl-1-[4-(2-pyridinyl)benzyl]pentyl}amino)carbonyl]-2,2-dimethylpropylcarbamate

Participants

Reaction Conditions

Reaction Steps

A solution containing the product from Example 2C (0.01 g, 0.019 mmol) in THF (0.2 mL) was treated with the product from Example 7B (0.009 g, 0.021 mmol), DEPBT (0.009 g, 0.030 mmol), and N,N-diisopropylethylamine (0.016 mL, 0.092 mmol), stirred at 25° C. for 16 hours and partitioned between a mixture of dichloromethane, ethyl acetate (2:1, respectively) and 10% Na2CO3 solution. The organic phase was washed with additional 10% Na2CO3 solution and brine, dried over MgSO4, filtered and concentrated. The residue was purified by reversed phase chromatography on a C18 column eluting with a gradient starting with 5-100% acetonitrile in water (0.1% TFA). The product was partitioned between a mixture of dichloromethane and ethyl acetate (2:1, respectively) and saturated NaHCO3 solution. The organic phase was washed with brine, dried over MgSO4, filtered and concentrated to give the title compound (0.0076 g, 51% yield). 1H NMR (300 MHz, DMSO-d6), δ ppm 0.82 (m, 18 H), 1.31 (m, 3 H), 1.52 (m, 2 H), 1.80 (m, 1 H), 2.45 (s, 3 H), 2.67 (m, 4 H), 3.09 (m, 4 H), 3.50 (s, 1 H), 3.66 (m, 1 H), 3.84 (d, J=9.93 Hz, 1 H), 3.93 (d, J=11.03 Hz, 1 H), 4.14 (m, 1 H), 4.35 (s, 1 H), 4.67 (d, J=7.35 Hz, 1 H), 6.64 (d, J=9.93 Hz, 1 H), 7.21 (m, 12 H), 7.66 (t, J=7.72 Hz, 1 H), 7.86 (m, 4 H), 8.63 (d, J=4.78 Hz, 1 H).

Provenance & Evidence