4-Methylmorpholine → (S)-methyl 2-(4-(tert-butyl)benzamido)-3-(4-(2-(4-(heptyloxy)benzoyl)hydrazinecarbonyl)phenyl)propanoate

Participants

Reaction Steps

To a stirring solution of (S)-4-(2-(4-(tert-butyl)benzamido)-3-methoxy-3-oxopropyl)benzoic acid INT-1 (260 mg, 0.68 mmol) in THF (5 mL) were added 4-methylmorpholine (0.15 mL, 1.36 mmol) and isobutyl carbonochloridate (0.09 mL, 0.71 mmol). After stirring at room temperature for 2 h, 4-(heptyloxy)benzohydrazide (187 mg, 0.75 mmol) was added and stirring continued for another 2 h. The reaction mixture was poured onto NaHCO3 (50 mL) and extracted with DCM (3×20 mL). The combined organics were dried over MgSO4 and evaporated. The crude product was purified by column chromatography (100% EA in iso-hexanes) to afford 297 mg (71%) of (S)-methyl 2-(4-(tert-butyl)benzamido)-3-(4-(2-(4-(heptyloxy)benzoyl)hydrazinecarbonyl)phenyl)propanoate INT-3 as an off-white foam. LCMS-ESI (m/z) calculated for C36H45N3O6: 615.8 found 616.0 [M+H]+, tR=2.89 min. (Method 4).

Provenance & Evidence