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| entry | solvent | scale (mmol) | additive | method of purification | yield (%) | purity (%) |
|---|---|---|---|---|---|---|
| 1 | dioxane | 37.00 | TEA | flash chromatography | 97 | 99 |
| 2 | EtOAc | 37.00 | flash chromatography | 99 | 99 | |
| 3 | EtOAc | 37.00 | pad of silica (SiO2/5 = 15:1 w/w ) | 95 | 99 | |
| 4 | EtOAc | 73.00 | pad of silica (SiO2/5 = 8.3:1 w/w) | 99 | 99 | |
| 5 | EtOAc | 73.00 | crystallization (MeCN/MTBE 1:1/5 = 1.5:1 v/w) | 98 | 99 |
