Methyl N-(triethylammoniosulfonyl)carbamate → (S)-tert-Butyl 4-(1-cyano-2-(4-(3-(2-methoxyethyl)-2-oxo-2,3-dihydrobenzo[d]oxazol-5-yl)phenyl)ethylcarbamoyl)tetrahydro-2H-pyran-4-ylcarbamate

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Reaction Steps

(S)-tert-Butyl 4-(1-amino-3-(4-(3-(2-methoxyethyl)-2-oxo-2,3-dihydrobenzo[d]oxazol-5-yl)phenyl)-1-oxopropan-2-ylcarbamoyl)tetrahydro-2H-pyran-4-ylcarbamate (Example 24, step (ii), 162 mg) in dichloromethane (8 mL) was treated with Burgess' reagent (133 mg) and the mixture was stirred at room temperature for 18 h. The solvent was partially evaporated and the mixture was purified by chromatography on silica eluting with 1:1 ethyl acetate/isohexane as eluent to yield a white solid (141 mg).

Provenance & Evidence