Palladium-catalyzed stereoselective annulation of a functional vinylstannane by acylchlorides gives the corresponding alpha-pyran-2-ones in good yields. This annulation most probably proceeds through a Stille reaction/cyclization sequence.
Proton and carbon-13 NMR of vinyl ketene and its dimerization by [4 + 2] cycloaddition. Synthesis of sibirinone and bicyclo[4.2.1]nona-3,7-diene-2-one
作者:Walter S. Trahanovsky、Bruce W. Surber、Marty C. Wilkes、Margaret M. Preckel
DOI:10.1021/ja00388a049
日期:1982.12
Synthesis of 6-Substituted 2-Pyrones Starting from Renewable Resources: Total Synthesis of Sibirinone, (<i>E</i>)-6-(Pent-1-en-1-yl)-2<i>H</i>-pyran-2-one, and (<i>E</i>)-6-(Hept-1-en-1-yl)-2<i>H</i>-pyran-2-one
作者:Daniel Dobler、Oliver Reiser
DOI:10.1021/acs.joc.6b01339
日期:2016.11.4
An atom-economic reaction sequence to 6-substituted 2-pyrones was developed startingfrom furfuryl alcohol, a renewable resource made from bran or bagasse, and aldehydes, utilizing a thermal rearrangement of cyclopentadienone epoxides as key step. Derivatives bearing a hydroxyalkyl side chain could be enzymatically resolved, providing access to enantiomerically pure 2-pyrones, or converted to alkenyl-substituted