Methanesulfonyl chloride → HCID 67057891, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution 1-benzyl 4-ethyl-5-hydroxyazepane-1,4-dicarboxylate (4.4 g, 13.7 mmol) in THF (100 ml) was added MsCl (2.58 ml, 33.6 mmol) and TEA (5.69 ml, 40.5 mmol) in three portions over 16 hours. The mixture was then concentrated, diluted with dichloromethane (100 ml), washed with saturated aqueous NaHCO3 (2×50 ml), dried (MgSO4), filtered and reconcentrated. The residue was dissolved in THF (100 ml) and DBU (3.1 ml, 20.6 mmol) was added and the resulting mixture was heated at 80° C. for 1 hour. The reaction was then concentrated, diluted with dichloromethane (100 ml), washed with saturated aqueous NaHCO3 (3×30 ml), dried (MgSO4), filtered and reconcentrated. The residue was purified via silica FCC (using a gradient of eluents; 9:1 to 7:3 Hexane/EtOAc) to give the title product as colourless oil (2.1 g, 51%).

Provenance & Evidence