Abstract
Abstract 4-Pentenenitriles reacted with PhI(OAc)2 in acetic acid in the presence of 48% HBF4 at 70 ° C to afford the dihydro-5-acetoxymethyl-2(3H)-furanones in good yields. Similarly 3-butenenitriles gave the dihydro-4- acetoxy-2(3H)-furanones although in lower yields. Parallel experiments showed that under the same conditions 4-pentenoic and 3-pentenoic acids reacted much more easily and gave the same acetoxy- lactonization process at room temperature.
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