Diisopropylethylamine → (2S)-N1-((1S,2R)-1-benzyl-3-sec-butoxy[(4-methoxyphenyl)sulfonyl]amino-2-hydroxypropyl)-2-[(2-quinolinylcarbonyl)amino]butanediamide

Participants

Reaction Steps

N-[(2R,3S)-3-amino-2-hydroxy-4-phenylbutyl]-N-(sec-butoxy)-4-methoxybenzenesulfon-amide (Step 1, Example 67) (0.114 mmol, 48 mg), (2S)-4-amino-4-oxo-2-((2-quinolinylcarbonyl)amino]butanoic acid hydrochloride (0.136 mmol, 42 mg), 1-hydroxybenzotriazole hydrate (0.136 mmol, 19 mg), N-(3-Dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (0.148 mmol, 28 mg), diisopropylethylamine (5.68 mmol, 0.990 mL) and anhydrous N,N-dimethylformamide (0.5 mL) were combined at room temperature and stirred for 15 hours. The crude reaction mixture was concentrated to a residue, dissolved in ethyl acetate, washed with 1N HCl, 5% aq. potassium carbonate solution, brine and dried over magnesium sulfate. The solution was concentrated to a residue, purified by silica gel chromatography (1:1 hexanes/ethyl acetate) and crystallization from ether and hexanes, providing 20 mg (25%) of a pink solid. H1-NMR (CDCl3) δ 9.20-9.18 (1H,m), 8.32-8.30 (1H,m), 8.22-8.16 (2H,m), 7.89-7.87 (1H,m), 7.80-7.76 (3H,m), 7.65-7.61 (1H,m), 7.14-7.11 (2H,m), 7.05-6.97 (6H,m), 5.76-5.64 (1H,bs), 5.49-5.26 (1H,m), 4.94-4.86 (1H,m), 4.36-4.14 (2H,m), 3.99-3.80 (1H,m), 3.86 (3H,s), 3.14 (1H,bs), 2.98-2.71 (5H,m), 2.71-2.59 (1H,m), 1.80-1.52 (1H,m), 1.48-1.30 (1H,m), 1.22-1.14 (3H,m), 0.94-0.80 (3H,m); MS (ESI): M+H=692.

Provenance & Evidence