Diisopropylethylamine → (2S,3R)-N-((S)-3-(cyclohex-1-en-1-yl)-1-((R)-2-methyloxiran-2-yl)-1-oxopropan-2-yl)-3-hydroxy-2-((S)-3-hydroxy-2-(2-morpholinoacetamido)propanamido)-3-(4-methoxyphenyl)propanamide

Participants

Reaction Steps

Sequentially HATU (537 mg, 1.41 mmol) and DIEA (1.02 mL, 5.88 mmol) were added to a 0° C. solution of (2S,3R)-3-hydroxy-2-((S)-3-hydroxy-2-(2-morpholinoacetamido)propanamido)-3-(4-methoxyphenyl)propanoic acid (500 mg, 1.18 mmol) and (S)-2-amino-3-(cyclohex-1-en-1-yl)-1-((R)-2-methyloxiran-2-yl)propan-1-one (TFA salt, 364 mg, 1.18 mmol) in DMF (10 mL). The reaction mixture was allowed to warm to ambient temperature and stirred for 30 min. The mixture was concentrated and the residue was purified by flash column chromatography on silica gel (DCM/MeOH=50:1 to 30:1) twice to afford (2S,3R)-N-((S)-3-(cyclohex-1-en-1-yl)-1-((R)-2-methyloxiran-2-yl)-1-oxopropan-2-yl)-3-hydroxy-2-((S)-3-hydroxy-2-(2-morpholinoacetamido)propanamido)-3-(4-methoxyphenyl)propanamide (500 mg, 57% yield) as a colorless solid. 1H NMR (300 MHz, DMSO-d6): δ 7.97 (d, J=7.5 Hz, 1H), 7.86 (d, J=9.0 Hz, 1H), 7.75 (d, J=7.5 Hz, 1H), 7.26 (d, J=8.7 Hz, 2H), 6.80 (d, J=8.7 Hz, 2H), 5.61 (d, J=4.5 Hz, 1H), 5.40-5.38 (m, 1H), 5.23-5.21 (m, 1H), 5.04-5.02 (m, 1H), 4.62-4.51 (m, 1H), 4.45-4.35 (m, 2H), 3.71 (s, 3H), 3.68-3.41 (m, 6H), 3.33 (s, 1H), 3.21 (d, J=5.1 Hz, 1H), 2.97-2.80 (m, 3H), 2.39-2.21 (m, 4H), 2.11-1.71 (m, 4H), 1.56-1.40 (m, 4H), 1.26 (s, 3H), 1.28-1.22 (m, 1H). MS(EI) for C31H44N4O9, found 617.4 (MH)+.

Provenance & Evidence