(-)-亚奎宁酸具有八种可能的立体异构体,它们既可以天然存在,也可以作为热食品加工的产物出现。在这方面的贡献,我们已经合成了选择性四种异构体,即,外延-quinic酸,粘膜-quinic酸,顺-quinic酸和鲨-quinic酸,开发一个串联LC-MS方法确定所有的立体异构奎尼酸。通过单晶X射线晶体学已明确表征了四种衍生物。通过使用乙酸/浓H 2 SO 4对(-)-奎宁酸进行非选择性异构化,可获得缺少的奎宁酸非对映异构体允许进行色谱分离和奎宁酸的所有非对映异构体分配。我们首次报告,根据其串联质谱碎片质谱图及其洗脱顺序,可以可靠地区分一整套立体异构体。提出了特征性碎片机制的原理。在这项研究中,我们还观察到粘膜-quinic酸,鲨-quinic酸和外延-quinic酸存在于水解危地马拉焙炒咖啡样品焙烧可能的产品。
1-Desoxy-2-Methylene-19-Nor-Vitamin D Analogs and Their Uses
申请人:DeLuca Hector F.
公开号:US20110082121A1
公开(公告)日:2011-04-07
This invention discloses 1-desoxy-2-methylene-19-nor-vitamin D analogs, and specifically (20S)-25-hydroxy-1-desoxy-2-methylene-19-nor-vitamin D
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and pharmaceutical uses therefor. This compound exhibits relatively high binding activity and pronounced activity in arresting the proliferation of undifferentiated cells and inducing their differentiation to the monocyte thus evidencing use as an anti-cancer agent especially for the treatment or prevention of leukemia, colon cancer, breast cancer, skin cancer or prostate cancer.
products--polyoxygenated cyclohexenes exhibited potent anti-tumor activity, such as zeylenone, which is a natural product isolated from Uvaria grandiflora Roxb. This article will attempt to establish a gram-scale synthesis method of (+)-zeylenone and explain the structure–activityrelationship of this kind of compound. Total synthesis of (+)-zeylenone was completed in 13 steps with quinic acid as the