Ammonium Chloride → 2-(trimethylsilyl)ethyl (S)-2-(3-(1-hydroxy-5-methoxy-1-phenylpentyl)cyclohexanecarboxamido)-3-cyclohexylpropyl-methylcarbamate

Participants

Reaction Steps

A stirred solution of 2-(trimethylsilyl)ethyl (S)-2-(3-benzoylcyclohexanecarboxamido)-3-cyclohexylpropylmethylcarbamate (111 mg, 0.21 mmol) in dry THF (2 mL) was cooled to −70° C. and methoxybutylmagnesium chloride in THF (0.5 mL of 2 M, 1.0 mmol) was added dropwise over 2 min. The cooling bath was allowed to expire and the mixture was stirred as it warmed to rt. After 2 h, the mixture was poured into sat'd aqueous NaHCO3 (20 mL) and sat'd aqueous NH4Cl (20 mL) was added. The mixture was extracted with EtOAc (2×50 mL). The combined organic extracts were washed with brine (15 mL), dried over Na2SO4 and evaporated under reduced pressure to leave crude 2-(trimethylsilyl)ethyl (S)-2-(3-(1-hydroxy-5-methoxy-1-phenylpentyl)cyclohexanecarboxamido)-3-cyclohexylpropyl-methylcarbamate as an oil (124 mg, 95%). MS ESI+ve m/z 617 (M+1).

Provenance & Evidence