D-Malic acid → 2-((r)-2-((r)-3-Methyl-1-((s)-3-phenyl-2-(pyrazine-2-carboxamido)propanamido)butyl)-5-oxo-1,3,2-dioxaborolan-4-yl)acetic acid

Participants

Reaction Steps

A mixture of N,N′,N″-(boroxin-2,4,6-triyltris{[(1R)-3-methylbutane-1,1-diyl]imino[(2S)-1-oxo-3-phenylpropane-1,2-diyl]})tripyrazine-2-carboxamide (0.305 g, 0.278 mmol) and D-malic acid (130.3 mg, 0.33 mmol) were mixed in acetone (3 mL). The mixture was heated to form a solution. The solution was cooled uncontrolled until the internal temperature was about 25° C. White solid precipitated out and the resultant slurry was agitated at ambient temperature for 3 h. The slurry was filtered to collect solid 2-((R)-2-((R)-3-methyl-1-((S)-3-phenyl-2-(pyrazine-2-carboxamido)propanamido)butyl)-5-oxo-1,3,2-dioxaborolan-4-yl)acetic acid (0.410 g, 100%). [M+H] calculated for C23H28BN4O7, 483.2051. found, 483.2.

Provenance & Evidence