Author： Essig Susi Scheffold Rolf
Publisher： Swiss Chemical Society
ISSN： 0009-4293
Source： CHIMIA International Journal for Chemistry, Vol.45, Iss.1-2, 1991-01, pp. : 30-32
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Abstract
Achiral cyclic 1,4-epiperoxides undergo fast isomerization to optically active 4-hydroxycycloalk-2-en-1-ones in presence of catalytic amounts of cob(II)alamin (B12r). Light-induced oxygenation of cyclic conjugated dienes in MeOH to 1,4-epiperoxides followed by isomerization with 0,5 mol-% B12 and 5 mol-% vitamin C in the same solvent allows the conversion of cyclohexa-1,3-diene to (S)-4-hydroxycyclohex-2-en-1-one (yield 50%,ee 17%) and of cyclopentadiene to (S)-4-hydroxycyclopent-2-en-1-one (yield 70%, ee = 17.5%) in one pot.
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