Dimethyl Sulfoxide → HCID 15117217, compound

A methylene chloride solution (375 ml) of dimethyl sulfoxide (21.8 ml) was cooled to -70° C. and a methylene chloride solution (125 ml) of oxalyl chloride (13.4 ml) was added thereto below -50° C. After completion of the addition, the mixture was stirred for 30 minutes, at the end of which time a solution of 1-allyloxycarbonyl-3-hydroxypyrrolidine (25 g) in methylene chloride (125 ml) was added below -50° C. The mixture was stirred at the same temperature for 1 hour and, then, triethylamine (101 ml) was added at a temperature below -50° C. The mixture was further stirred at that temperature for 1 hour. Thereafter, the temperature was allowed to rise gradually to room temperature and the reaction mixture was diluted with water and allowed to stand. The aqueous layer was then separated and extracted with 2 portions of methylene chloride. The organic layers were combined, washed with 1N hydrochloric acid, saturated aqueous sodium hydrogen carbonate solution, water and aqueous sodium chloride solution successively, and dried over anhydrous magnesium sulfate. Finally the solvent was distilled off under reduced pressure to give 1-allyloxycarbonyl-3-oxopyrrolidine (24.5 g).

1. custombelow -50° C
2. additionAfter completion of the addition
3. additionwas added below -50° C
4. stirringThe mixture was further stirred at that temperature for 1 hour
5. customto rise gradually to room temperature
6. customThe aqueous layer was then separated
7. extractionextracted with 2 portions of methylene chloride
8. washwashed with 1N hydrochloric acid, saturated aqueous sodium hydrogen carbonate solution, water and aqueous sodium chloride solution successively
9. dry with materialdried over anhydrous magnesium sulfate
10. distillationFinally the solvent was distilled off under reduced pressure

ORD record

ord-62c1e36b58dd4fe8a401b5a7c754955b

Source dataset

uspto-grants-1992_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05102877