Water → Tris(2-carboxyethyl)phosphine

Participants

Reaction Conditions

Reaction Steps

A mixed solution of water (2.46 ul), 2-mercaptophenol (5.03 ul, 0.050 mmol), (S,Z)-(2,2-dimethyl-1,3-dioxolan-4-yl)methyl 2-cyano-2-(hydroxyimino)acetate separately synthesized according to a conventional method (Organic Letter, 2012, 14, 3372-3375) (Compound SP517) (11.0 mg, 0.050 mmol), triethylamine (13.94 ul, 0.100 mmol), 1 M phosphate buffer (pH=7.7, 52.4 ul), a 0.5 M aqueous tris(2-carboxyethyl)phosphine solution (pH=7.6, 10.0 ul) and N-methylpyrrolidone (1.65 ul) was prepared. 10 ul of a 10 mM solution of S-benzyl (3S,6S,9S,12S,15S,21S,24S,27S)-27-amino-3-(((S)-1-(((S)-1-((2-amino-2-oxoethyl)amino)-3-hydroxy-1-oxopropan-2-yl)amino)-1-oxopropan-2-yl)(methyl)carbamoyl)-6,21-dibenzyl-15-isobutyl-9-isopropyl-12,22,24-trimethyl-5,8,11,14,17,20,23,26-octaoxo-28-phenyl-4,7,10,13,16,19,22,25-octaazaoctacosane-1-thioate (Compound SP-508) in N-methylpyrrolidone and a 11 mM solution of internal standard (4-propylbenzoic acid) in N-methylpyrrolidone (4.56 ul) were added to the mixed solution, and the mixture was stirred at 30° C. for 1 hour. The pH at the start of the reaction was 7.0. The time course of the reaction was observed by LCMS. After stirring for 1 hour, the masses of the title compound (SP-509), the hydrolysate (Compound SP-510) and the ester-exchanged compound (Compound SP-516) were observed to find that the mass intensity ratio (−) by LCMS is approximately 4:5:2.

Provenance & Evidence