Ethyl Acetate → Methyl(2S)-2-[(22S)-8-bromo-5-chloro-17-fluoro-4,22,28-trimethyl-21,27-dioxa-1,7,34-triazahexacyclo[26.2.2.16,9.110,14.02,7.015,20]tetratriaconta-2, 4, 6(34),8,10(33),11,13,15(20),16,18-decaen-3-yl]-2-(tert-butoxy)acetate

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Reaction Steps

Methyl(2S)-2-[(22S)-8-bromo-17-fluoro-4,22,28-trimethyl-21,27-dioxa-1,7,34-triazahexacyclo[26.2.2.16,9.110,14.02,7.015,20]tetratriaconta-2,4,6(34),8,10(33),11,13,15(20),16,18-decaen-3-yl]-2-(tert-butoxy)acetate (50 mg, 0.068 mmol, 1.0 equiv) was dissolved in acetonitrile (1357 μl). To this solution was added 1-chloropyrrolidine-2,5-dione (9.06 mg, 0.068 mmol, 1.0 equiv) and stirred for 3 hours. The mixture was diluted by 15 mL Ethyl Acetate, washed by NaHCO3 and brine. The organic layer was dried, concentrated, and purified on ISCO 12 g column (0-100% EtOAc [2% TEA]/Hexane) to give the product (30 mg, 0.039 mmol, 57.3% yield).

Provenance & Evidence