American Chemical Society
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Carbonylation of Alkynyl Epoxides:  Synthesis of 5-Hydroxy-2,3-dienoate Esters and 2,3-Dihydrofuran-3-ol Derivatives

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journal contribution
posted on 1997-11-28, 00:00 authored by Marcelo E. Piotti, Howard Alper
The carbonylation of alkynyl oxiranes catalyzed by (MePh2)4Pd in the presence of 20 atm of carbon monoxide in methanol gives methyl 5-hydroxy-2,3-pentadienoates in good yields. When the reaction is performed on alkynyl oxiranemethanol derivatives, 4,5-dihydrofuran-3-ol derivatives are obtained stereoselectively. These products arise from the spontaneous cyclization of a dihydroxyallenyl ester intermediate.