Toluene → 3,4-dihydro-2H-thieno[3,4-b]thiopyran

Participants

Reaction Conditions

Reaction Steps

Into a 500 ml three-necked flask (reaction container) with thermometer, 2.47 g (13.1 mmol) of 3-(4-methoxythiophene-3-yl) propane-1-thiol represented by the chemical formula (III-B), 320 mg (2.32 mmol) of sodium hydrogen sulfate monohydrate and 100 ml of toluene were transferred and heated to 110° C., then stirred for a period of 8 hours. After the reaction was completed, 100 ml of water was added to separate the organic layer from the water layer. The organic layer was washed twice each with 100 ml of water, and then dried over anhydrous sodium sulfate. Then it was condensed under a reduced pressure, thereby obtaining a crude product. This crude product was purified using silica gel column chromatography to obtain 3,4-dihydro-2H-thieno[3,4-b]thiopyran (1.68 g, 10.8 mmol, 82.4%) represented by the formula (II-B) having properties shown below. The chemical reaction equation (XII-B) is shown below.

Provenance & Evidence