Utilisation d'ylides du phosphore en chimie des sucres. XX. Synthèse de sucres acétyléniques et réarrangment d'intermédiaires carbénoïdes. Communication préliminaire
作者:Jean M. J. Tronchet、Alberto Gonzalez、Jean-Bernard Zumwald、Françoise Perret
DOI:10.1002/hlca.19740570605
日期:——
chain extension by one carbon unit, are described. In the first procedure, an aldehydo-sugar is treated with dibromomethylenetriphenyl-phosphorane, then with n-butyllithium and finally with water. The second method involves an one-step reaction between an aldehydo-sugar and dimethyl diazomethylphosphonate. The acetylenic sugars obtained are valuable synthetic intermediates for the preparation of heterocyclic