Dimethyl Sulfoxide → (E)-3-[(2S,4S)-N-Allyloxycarbonyl-4-mercaptopyrrolidin-2-yl]-N,N-dimethylacrylamide

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Reaction Steps

The same operation as in Reference Example 4-1) was carried out by using (2S,4S)-N-allyloxycarbonyl-2-hydroxymethyl-4-tritylthiopyrrolidine (the compound obtained in Reference Example 3-1); 11.12 g, 24.2 mmol), dimethyl sulfoxide (4.81 ml, 67.7 mmol), oxalyl chloride 3-(diethylphosphono)-2-oxopyrrolidine (5.35 g, 24.2 mmol) and 60% sodium hydride (870 mg, 21.8 mmol), followed by flash column chromatographic purification on silica gel (Wakogel® C-300, 100 ml, elution with hexane-ethyl acetate 1:1 - ethyl acetate) to give the title compounds ((Z)-form 2.72 g, 21.4% yield; (E)-form 5.15 g, 40.6 % yield).

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