Abstract
The 1,3 dipolar cycloadditions of diazomethane and ethyl diazoacetate with differently substituted 5-sulfur-2(5 H)-furanones ( 1–6) are reported. Cycloaddition of diazomethane occurs in a regio- and stereospecific manner to give the expected adducts 9–14, in good yield. The cycloaddition with ethyl diazoacetate occurs also in a regio- and stereospecific manner, but affords the corresponding 2-pyrazolines 15–19.
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