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Oxonium ylide intermediates generated fromα-diazocarbonyl compounds and water were trapped by Zn(Ⅱ)-activatedα-dicarbonyl compounds.The reaction gaveα,β-dihydroxyl acid derivatives in moderate yield.
Oxonium ylide intermediates generated from α-diazocarbonyl compounds and water were trapped by Zn (Ⅱ) -activated α-dicarbonyl compounds. The reaction gave α, β-dihydroxyl acid derivatives in moderate yield.