HCID 131719567, compound → HCID 131719566, compound

Participants

Reaction Steps

175 mg of N-tert-butoxycarbonyl-2-methylene-4(S)-hydroxy-5(S)-amino-7(S)-isopropyl-8-(3-benzyloxy-4-tert-butyl-phenyl)-octanoic acid (N-butyl)amide are hydrogenated in the presence of 12 mg of [Ru2Cl4 (S-Binap)2 ]·(NEt3) in 30 ml of methanol for 20 hours at room temperature and under 30 bar. The reaction mixture is filtered, concentrated by evaporation and purified by means of FC (hexane/ethyl acetate=1:1). The title compound so obtained (Rf in hexane/ethyl acetate=1:1)=0.15 is deprotected by hydrogenation with 90 mg of 10% Pd/C in 10 ml of methanol at room temperature and under normal pressure to form N-tert-butoxycarbonyl-2(R)-methyl-4(S)-hydroxy-g(S)-amino-7(S)-isopropyl-8-(3-hydroxy-4-tert-butyl-phenyl)-octanoic acid (N-butyl)amide.

Provenance & Evidence