Ethyl isocyanate → 3-{[(3-[(tert-Butoxycarbonyl)amino]-2-{4-[2-(2,6-dichloro-4-methylphenoxy)ethoxy]benzyl}propanoyl)(cyclopropyl)amino]methyl}-5-(3-methoxypropyl)phenyl ethylcarbamate

Participants

Reaction Steps

To a solution of tert-butyl (3-{cyclopropyl[3-hydroxy-5-(3-methoxypropyl)benzyl] (cyclopropyl)amino}-2-{4-[2-(2,6-dichloro-4-methylphenoxy)ethoxy]benzyl}-3-oxopropyl)carbamate from Example 70, Step 2 (1 eq.) in dichloromethane (0.08 M) was added ethyl isocyanate (3 eq.), triethylamine (3 eq.) and a few crystals of DMAP. The resulting solution was stirred at RT for 1.5 h. The reaction mixture was concentrated in vacuo and directly subjected to purification by way of column chromatography (SiO2, 3:2 (v/v) Hex:EtOAc→2:3 (v/v) Hex:EtOAc). The title compound was isolated as a colorless oil.

Provenance & Evidence