Trifluoroacetic acid → 2-{2-[2-(1-Carboxy-3-methyl-butylcarbamoyl)-5-methyl-phenyldisulfanyl]-4-methylbenzoylamino}-4-methyl-pentanoic acid

Participants

Reaction Steps

This compound was prepared according to the procedure described in Example 50 using [S-(R*,R*)]-2-[2-[2-(1-tert-butoxycarbonyl-3-methyl-butylcarbamoyl)-5 -methyl-phenyldisulfanyl]-4-methylbenzoylamino]-4-methyl-pentanoic acid tert-butyl ester (1.9 g, 2.8 mmol) from Example 33, 20 mL dichloromethane, 20 mL trifluoroacetic acid and 2.0 mL anisole. The crude product was recrystallized from methanol/water to afford 1.4 g of the title compound, mp 216°-218° C.

Provenance & Evidence