반응 #161992

반응 방정식

pentafluorophenyl trifluoroacetate

#196

1,2-dimethyl-D-prolyl-N-[(2R,3S,4S)-1-carboxy-2-methoxy-4-methylhexan-3-yl]-N-methyl-L-valinamide

pyridine

→

compound #197

1,2-dimethyl-D-prolyl-N-[(3R,4S,5S)-3-methoxy-5-methyl-1-oxo-1-(pentafluorophenoxy)heptan-4-yl]-N-methyl-L-valinamide

용매

dichloromethane

dichloromethane

반응 조건

후처리

1. 1
   농축the solvent was concentrated in vacuo
2. 2
   기타The residue was purified by silica gel chromatography (Gradient: 1 to 10% methanol in dichloromethane)

실험 절차

To a cooled solution (0° C.) of #196 (4.0 g, 9.4 mmol, 1 eq.) in dichloromethane (40 mL) was added dropwise pyridine (2.95 g, 37.6 mmol, 4 eq.) followed by a solution of pentafluorophenyl trifluoroacetate (3.9 g, 13.6 mmol, 1.4 eq.) in dichloromethane (5 mL). The mixture was stirred at room temperature for one hour, and the solvent was concentrated in vacuo. The residue was purified by silica gel chromatography (Gradient: 1 to 10% methanol in dichloromethane) to afford compound #197 (4.5 g, 81.2% (over three steps) as white solid.

출처