4-(3-((tert-Butoxycarbonyl)amino)-1-(isoquinolin-6-ylamino)-1-oxopropan-2-yl)benzyl 2,4-dimethylbenzoate → (R)-4-(3-((tert-butoxycarbonyl)amino)-1-(isoquinolin-6-ylamino)-1-oxopropan-2-yl)benzyl 2,4-dimethylbenzoate

Participants

Reaction Steps

(S)-4-(3-(tert-butoxycarbonylamino)-1-(isoquinolin-6-ylamino)-1-oxopropan-2-yl)benzyl 2,4-dimethylbenzoate (E145-S) and (R)-4-(3-(tert-butoxycarbonylamino)-1-(isoquinolin-6-ylamino)-1-oxopropan-2-yl)benzyl 2,4-dimethylbenzoate (E145-R) were prepared from E145 according to the scheme in FIG. 10. 4-(3-(tert-butoxycarbonylamino)-1-(isoquinolin-6-ylamino)-1-oxopropan-2-yl)benzyl 2,4-dimethylbenzoate was dissolve in methanol and the R and S enantiomers separated by supercritical fluid chromatography (Chiralpak AS-H column, eluent: 18.8% MeOH, 0.2% dimethylethylamine, 80% CO2). The enantiomers were then each purified by column chromotagraphy (SiO2, 0-5% MeOH/CH2Cl2gradient). The enantiomeric excess for each enantiomer was >98%.

Provenance & Evidence