2,6-dimethoxycyclohexa-2,5-diene-1,4-dione

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2,6-Dimethoxybenzoquinone (2.0 g) was dissolved in ethanol (95%, 22 ml), water (6 ml), THF (15 ml) and DIEA (1.55 g). 3-mercaptopropionic acid (0.64 g) in ethanol (10 ml) was added in a dropwise fashion within 20 minutes, with stirring and cooling in an ice bath. The reaction was then allowed to proceed at room temperature. After 1.5 hours the reaction medium changed to a deep reddish color. The mixture was filtered and the filtrate evaporated in vacuo to give a solid mixture. This solid mixture was eluted via a silical gel chromatographic column (silica gel 60, [230-400 mesh], Merck) by using CHCl3 /MeOH/AcOH (97:2:1) as the mobile phase. The purified product DMQ-MP was crystallized from ether in a 26.5% yield (0.53 g). Melting point: 113°-115° C. Anal. calcd. for C11H14SO6, C 48.16, H 5.16; Found C 48.16, H 5.17. FABMS (fast atom bombardment mass spectrometry) [M-H]- (Xe beam) 273.19. cooling in an ice bath to proceed at room temperature The mixture was filtered the filtrate evaporated in vacuo to give a solid mixture This solid mixture was eluted via a silical gel chromatographic column (silica gel 60, [230-400 mesh], Merck) The purified product DMQ-MP was crystallized from ether in a 26.5% yield (0.53 g)