Photoassisted Cobalt-Catalyzed Asymmetric Reductive Grignard-Type Addition of Aryl Iodides
作者:Xuan Jiang、Hao Jiang、Qian Yang、Ying Cheng、Liang-Qiu Lu、Jon A. Tunge、Wen-Jing Xiao
DOI:10.1021/jacs.2c02481
日期:2022.5.11
Grignard addition is one of the most important methods used for syntheses of alcohol compounds and has been known for over a hundred years. However, research on asymmetric catalysis relies on the use of organometallic nucleophiles. Here, we report the first visible-light-induced cobalt-catalyzed asymmetric reductive Grignard-type addition for synthesizing chiral benzyl alcohols (>50 examples, up to
A simple and cost-effective synthesis of sulfated β-cyclodextrin and its application as chiral mobile phase additive in the separation of cloperastine enantiomers
synthesized sulfated β-cyclodextrin pH 3.0 and 45% methanol as mobile phase. The method utilizing synthesized sulfated β-cyclodextrin as chiral mobile phase additive was validated as per ICH guidelines and applied for the quantitative determination of cloperastine enantiomers in active pharmaceutical ingredients and pharmaceutical formulations. The selectivity changes imparted by sulfated β-cyclodextrin
已经描述了一种使用氨基磺酸作为磺化剂合成硫酸化 β-环糊精(一种最广泛使用的手性流动相添加剂)的简单且具有成本效益的方法。对该方法进行了优化,对合成的产物进行了光谱、尺寸排阻色谱、热和显微镜等方法的表征,并与市售的Sigma Aldrich硫酸化β-环糊精进行了比较。β-环糊精、羟丙基 β-环糊精、硫酸化 β-环糊精(市售和合成)被评估为手性流动相添加剂,用于使用反相 HPLC 对镇咳剂氯哌斯汀进行对映体分离。在优化条件下,非手性 Kromasil C 8在 15 分钟内达到 3.14 的分辨率(150 × 4.6 mm, 5 µm) 色谱柱,含有 10 mM 合成硫酸化 β-环糊精 pH 3.0 和 45% 甲醇的 5 mM 磷酸二氢钾作为流动相。采用合成硫酸化 β-环糊精作为手性流动相添加剂的方法根据 ICH 指南进行了验证,并应用于活性药物成分和药物制剂中氯哌斯汀对映体的定量测定。硫