Diisopropylethylamine → Methyl 2-[4-((2S)-2-[(benzyloxy)carbonyl]amino-3-[4-(1,1-dioxido-3-oxoisothiazolidin-5-yl)phenyl]propanoylamino)butoxy]-6-hydroxybenzoate

Participants

Reaction Steps

A solution of (2S)-2-[(benzyloxy)carbonyl]amino-3-[4-(1,1-dioxido-3-oxoisothiazolidin-5-yl)phenyl]propanoic acid (10 mg, 23.1 μmol), benzotriazol-1-yloxytris(dimethylamino)phosphonium hexafluorophosphate (10.7 mg, 24.3 μmol) and N,N-dimethylformamide (1 mL) was stirred at 0° C. After stirring for 15 min, methyl 2-(4-aminobutoxy)-6-hydroxybenzoate (6.09 mg, 25.4 μmol) and N,N-diisopropylethylamine (12.1 μL) were added to the reaction. The resulting mixture was stirred at 25° C. for 3 h. The reaction solution was diluted with acetonitrile and purified by preparative LCMS to yield the desired product (4.7 mg, 31%). MF=C32H35N3O10S; LCMS found for C32H36N3O10S (M+H)+: m/z=654.

Provenance & Evidence