Baeyer–Villigeroxidation of cyclobutanones is achieved in current developed protocol with 10-methylacridinium perchlorate (AcrH+ClO4−) as a novel organocatalyst both with irradiation at room temperature and without irradiation at elevated temperature. Excellent yields of the corresponding lactones are obtained and the possible mechanism has been proposed.
A practical route from oxetane or thietane to γ‐(thio)butyrolactone via solvated‐proton‐assisted cobalt‐catalyzed carbonylative ring expansion under syngas atmosphere has been established. A wide variety of γ‐(thio)butyrolactones can be afforded in good to excellent yields. The versatility of this method has been well demonstrated in the synthesis of intermediates towards the natural product Arctigenin
Retention and Selectivity of Teicoplanin Stationary Phases after Copper Complexation and Isotopic Exchange
作者:Alain Berthod、Alain Valleix、Veronique Tizon、Estelle Leonce、Celine Caussignac、Daniel W. Armstrong
DOI:10.1021/ac010444t
日期:2001.11.1
Teicoplanin is a macrocyclic glycopeptide that is highly effective as a chiralselector for LC enantiomeric separations. Two possible interaction paths were investigated and related to solute retention and selectivity: (1) interactions with the only teicoplanin amine group and (2) role of hydrogen bonding interactions. Mobile phases containing 0.5 and 5 mM copper ions were used to try to block the
Method of producing optically active lactone compound
申请人:Kyushu University
公开号:EP1449840A1
公开(公告)日:2004-08-25
An optically active lactone compound is produced by using a complex in which Pd or Pt is a central metal and a compound having a specified structure is a ligand as a catalyst, and subjecting a cyclic ketone compound to a Baeyer-Villiger oxidation with a specified oxidizer.
Synthesis of Quaternary Carbon Centers via Hydroformylation
作者:X. Sun、K. Frimpong、K. L. Tan
DOI:10.1021/ja1036226
日期:2010.9.1
application of hydroformylation to the synthesis of quaternary carbon centers is reported. The synthesis of the highly substituted carbon is achieved by applying a catalyticamount of 1. Ligand 1 serves as a catalyticdirectinggroup by covalently and reversibly binding to both the substrate and catalyst. The intramolecular nature of the directinggroup strategy accelerates the hydroformylation reaction