κ-卡拉胶邻苯二甲酰基化衍生物的抗氧化活性研究

对κ-卡拉胶进行酸降解得到三种卡拉胶低聚糖,并进一步与苯二甲酰基合成制得三种分子量分别为1450、2520和3430的κ-卡拉胶邻苯二甲酰衍生物(LA、LB和LC)。对产物进行IR表征并对其取代度(DS)进行测定,并检测了产物对羟基自由基.OH、DPPH自由基和过氧化氢的清除活性以及还原能力。结果表明,上述三种κ-卡拉胶邻苯二甲酰衍生物的抗氧化能力强弱顺序依次为:LC>LA>LB,这可能与衍生物的羟基含量、取代基团的性质以及取代度等因素有关。     

Efficient synthesis of phthaloyl derivatives of α-amino carboxamides

A rapid and one-pot synthesis of phthaloyl derivatives of -amino carboxamides is described. In dichloromethane, -amino carboxamides react with mono-methylphthalate in the presence of BOP and i-Pr₂NEt to afford the intermediate N -[(o-methoxycarbonyl)benzoyl]amino carboxamides which undergo cyclization in dichloromethane/water in the presence of aqueous sodium hydroxide and tetrabutylammonium bromide catalyst to afford the corresponding N -phthaloyl amides in excellent yields.     

Efficient synthesis of phthaloyl derivatives of α-amino carboxamides

Summary A rapid and one-pot synthesis of phthaloyl derivatives of α-amino carboxamides is described. In dichloromethane, α-amino carboxamides react withmono-methylphthalate in the presence of BOP andi-Pr₂NEt to afford the intermediateN ^α-[(o-methoxycarbonyl)benzoyl]amino carboxamides which undergo cyclization in dichloromethane/water in the presence of aqueous sodium hydroxide and tetrabutylammonium bromide catalyst to afford the correspondingN ^α-phthaloyl amides in excellent yields.