反应详情

温度

0 °C

1-tert-Butoxycarbonylamino-2-(2-hydroxyethyl)-cyclopropanecarboxylic acid methyl ester (0.500 g, 1.93 mmol, from Example 104) was diluted in 8 mL DCM and cooled to 0° C. under an Ar atmosphere. TEA (0.54 mL, 3.9 mmol) and methanesulfonyl chloride (0.30 mL, 3.9 mmol) were added sequentially. After 2.5 h, the solvent was removed in vacuo and the residue taken up in EtOAc and H2O (15 mL each). The aqueous layer was extracted with 3×10 mL EtOAc. The combined organics were washed with brine and dried over anhydrous MgSO4. Following concentration in vacuo, the residue was purified by column chromatography on SiO2 (0 to 50% Hex/EA) to produce 1-tert-butoxycarbonylamino-2-(2-methanesulfonyloxyethyl)cyclopropanecarboxylic acid methyl ester (0.55 g, 84%). LCMS found 360.1 [M+Na]+.

1. customthe solvent was removed in vacuo
2. extractionThe aqueous layer was extracted with 3×10 mL EtOAc
3. washThe combined organics were washed with brine
4. dry with materialdried over anhydrous MgSO4
5. concentrationconcentration in vacuo
6. customthe residue was purified by column chromatography on SiO2 (0 to 50% Hex/EA)