Free aldopentoses and aldohexoses reacted respectively with (EtO) 2P(O)CHNaCOAr to give the five stereospecific free hydroxyl \%β\% C glycosides in one step. The reaction take place under a mild condition. The proced...Free aldopentoses and aldohexoses reacted respectively with (EtO) 2P(O)CHNaCOAr to give the five stereospecific free hydroxyl \%β\% C glycosides in one step. The reaction take place under a mild condition. The procedures are simple and convenient. The prices of starting materials are cheap. The method can be applied universally for aldopentoses and aldohexoses. The application scope of Wittig Horner reaction has also been expanded. The synthesis of free hydroxyl \%β\% C glycosides from free aldoses directly using Witting\|Horner reaction has not been reported so far.展开更多
1-Acetyl-2-naphthol was treated with aromatic aldehydes in the presence of piperidine for the preparation of the hydroxynaphthachalcones. However, the experimental result showed that the expected product was not forme...1-Acetyl-2-naphthol was treated with aromatic aldehydes in the presence of piperidine for the preparation of the hydroxynaphthachalcones. However, the experimental result showed that the expected product was not formed, but the β-naphthaflavanones were obtained instead. The synthesis of β-naphthaflavanones from β-naphtholethanone directly using piperidine as catalyst has not been reported so far.展开更多
文摘Free aldopentoses and aldohexoses reacted respectively with (EtO) 2P(O)CHNaCOAr to give the five stereospecific free hydroxyl \%β\% C glycosides in one step. The reaction take place under a mild condition. The procedures are simple and convenient. The prices of starting materials are cheap. The method can be applied universally for aldopentoses and aldohexoses. The application scope of Wittig Horner reaction has also been expanded. The synthesis of free hydroxyl \%β\% C glycosides from free aldoses directly using Witting\|Horner reaction has not been reported so far.
文摘1-Acetyl-2-naphthol was treated with aromatic aldehydes in the presence of piperidine for the preparation of the hydroxynaphthachalcones. However, the experimental result showed that the expected product was not formed, but the β-naphthaflavanones were obtained instead. The synthesis of β-naphthaflavanones from β-naphtholethanone directly using piperidine as catalyst has not been reported so far.
