Acetic Acid → Methyl 5,6-dihydro-2H-thiopyran-3-carboxylate

To a solution of 0.934 gm (5.75 mmol) of 5,6-dihydro-2H-thiopyran-3-carboxylate from part C in glacial acetic acid (40 mL) was added 1.98 gm (12.88 mmole) sodium perborate. The reaction mixture was stirred at 55° C. under N2 for 19 hrs. whereupon the solution was poured into H2O (50 mL) and neutralized with 50% NaOH to pH=7. The solution was extracted three times with methylene chloride. The combined organic layers were washed once with saturated sodium bicarbonate and once with saturated sodium chloride, dried over magnesium sulfate, filtered and concentrated in vacuo to give 0.832 gm (76%) of methyl 5,6-dihydro-2H-thiopyran-3-carboxylate, 1,1 dioxide as a white solid; mass spectrum m/e=190 (EI, M+) Part E: Preparation of Methyl-2H-thiopyran-3-carboxylate, 1,1-dioxide.

1. extractionThe solution was extracted three times with methylene chloride
2. washThe combined organic layers were washed once with saturated sodium bicarbonate and once with saturated sodium chloride
3. dry with materialdried over magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo

ORD record

ord-6c79871a7b724a4abeb7f4f920940efd

Source dataset

uspto-grants-2005_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06875790B2