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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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Isolation and structure of a rarely occurring cyanidanol glycoside from cortex betulae

L Langhammer1, G Schulze, R Gujer

  • 1Institut für Pharmakognosie und Phytochemie der Freien Universität Berlin.

Planta Medica
|November 1, 1983
PubMed

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Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide anion...