1-Chloroethyl chloroformate → (5-Methylthiophen-2-yl)(5-oxa-2,8-diazaspiro[3.5]nonan-8-yl)methanone hydrochloride

Participants

Reaction Steps

1-Chloroethyl chloroformate (0.508 mL) was added dropwise to a solution of (2-benzhydryl-5-oxa-2,8-diazaspiro[3.5]nonan-8-yl)(5-methylthiophen-2-yl)methanone (example 33, step g) (1.5 g) in acetonitrile (30 mL) at 0° C. The mixture was then heated at reflux for 1 hour under nitrogen. The solvent was removed under reduced pressure and the residue dissolved in methanol (50 mL). This solution was heated at reflux under nitrogen for 30 minutes. The solvent was removed under reduced pressure and the residue triturated with ethyl acetate (40 mL) and then with acetonitrile (7 mL) to yield the subtitled compound. Yield 0.29 g.

Provenance & Evidence