Cesium carbonate → HCID 86596886, compound

Participants

Reaction Steps

tert-Butyl (1R,3R,4S)-4-((S)-2-benzyloxycarbonylamino-4-(methylthio)butanamido)-3-(tert-butylsulfonylmethyl)cyclohexylcarbamate (6.2 g) was dissolved in iodomethane (60 mL) and CH2Cl2 (15 mL). The resulting solution was stirred at rt for 72 h before being concentrated in vacuo. The residue was dissolved in methylene chloride, and the resulting solution was concentrated; this was repeated to afford the salt. This material was dissolved in DMF (60 mL) and the solution was charged with Cs2CO3 (13.2 g). After 12 h, the reaction was partitioned between EtOAc and brine. The organic phase was dried (MgSO4), filtered, and concentrated to afford tert-butyl (1R,3R,4S)-4-((S)-3-benzyloxycarbonylamino-2-oxopyrrolidin-1-yl)-3-(tert-butylsulfonylmethyl)cyclohexylcarbamate (5.5 g). MS found: (M+H)+=566.5.

Provenance & Evidence