反应详情

A mixture of trifluoromethanesulfonic acid 2,2-difluoro-1(R)-(4-fluorophenyl)-2-(4-methylsulfanylphenoxy)ethyl ester (1.70 g, 3.8 mmol), 2(R)-amino-3-tritylsulfanylpropionic acid (1.38 g, 38 mmol) and diisiopropylethylamine (2.65 ml, 15.2 mol) in DCM (35 ml) was stirred for 19 h at room temperature. The solvent was evaporated under vacuum and the residue dissolved in ethyl ether (20 ml). The solution was washed with 1N HCl solution and brine. After drying over sodium sulfate, the solvent was evaporated and the crude was purified by flash chromatography, using a mixture of EA/H (1/3) as eluent to give 2(R)-[2,2-difluoro-1(S)-(4-fluorophenyl)-2-(4-methylsulfanylphenoxy)ethylamino]-3-tritylsulfanylpropionic acid (0.693 g, 27%) as a foam.

1. customThe solvent was evaporated under vacuum
2. dissolutionthe residue dissolved in ethyl ether (20 ml)
3. washThe solution was washed with 1N HCl solution and brine
4. dry with materialAfter drying over sodium sulfate
5. customthe solvent was evaporated
6. customthe crude was purified by flash chromatography
7. additiona mixture of EA/H (1/3) as eluent