Dichloromethane → Methanesulfonic acid 2-butyl-5-chloro-3-[2'-(1-trityl-1H-tetrazol-5-yl)-biphenyl-4-ylmethyl]-3H-imidazol-4-ylmethyl ester

Participants

Reaction Conditions

Reaction Steps

To a DCM (200 mL) solution of intermediate (1b) (13.6 g, 20.4 mmol), cooled to −78° C., was added methane sulfonyl chloride (6.3 mL, 81.6 mmol). The mixture was stirred at −78° C. for 15 minutes. A saturated NaHCO3 solution (100 mL) and EtOAc (500 mL) were added to the cooled mixture, which was then allowed to reach room temperature. The organic was washed an additional three times with saturated aqueous NaCl (100 mL). After drying over sodium sulfate and filtration, the removal of solvent provided intermediate (1c) as a yellow oil (15 g) which was used directly in the next step. MS m/z: [M+H+] calcd for C42H39ClN6O3S, 743.26; due to the reactive nature of intermediate (1c), only the methanol substituted product was observed upon running a mass spectrum of the sample when dissolved in methanol; methanol substituted product [M+H+]=679.6.

Provenance & Evidence