反应详情

A solution of 832 mg (4.37 mmole) of 5,6-dihydro-2H-thiopyran-3-carboxylate, 1,1 dioxide from part D in methanol (40 mL) was hydrogenated in the presence of 400 mg (50% wt) of 10% Pd/charcoal for 4 hrs. at room temperature and 50 psig of H2. The catalyst was removed by vacuum filtration through a short plug of packed celite and the solvent removed in vacuo to give 802 mg (96%) of methyl 2H-thiopyran-3-carboxylate, 1,1-dioxide as a white solid; mass spectrum m/z=193 (CI,M+H) Part F: Preparation of 2H-thiopyran-3-carboxylate, 1,1-dioxide.

1. customat room temperature
2. customThe catalyst was removed by vacuum filtration through a short plug of packed celite
3. customthe solvent removed in vacuo