[CH3:1][S:2]([CH2:5][C:6]([O:8][CH2:9][CH3:10])=[O:7])(=[O:4])=[O:3].CO[CH:13](OC)[N:14]([CH3:16])[CH3:15]>>[CH3:13][N:14]([CH3:16])[CH:15]=[C:5]([S:2]([CH3:1])(=[O:4])=[O:3])[C:6]([O:8][CH2:9][CH3:10])=[O:7]6.65 g (40 mmol) of ethyl methanesulphonylacetate and 5.72 g (48 mmol) of N,N-dimethylformamide dimethyl acetal are admixed and heated at 85° C. overnight. The solution is concentrated using a rotary evaporator, and the solid is comminuted with cyclohexane and filtered off with suction.
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