作者:Naohiro Uemura、Yasushi Yoshida、Takashi Mino、Masami Sakamoto
DOI:10.1016/j.tet.2020.131166
日期:2020.5
(R)-N-phenethylthioureas and benzoylformyl chloride were obtained as diasteromeric mixtures. These thiohydantoins have aminal carbons at the chiral center which could be epimerized via ring-opening and –closing reactions under suitable conditions. The suspension of the diastereomixture of thiohydantoins in a small amount of solvent selectively converged to crystals composed of a single diastereomer in a quantitative
首次开发了结晶诱导的非对映异构体转化的有价值的硫代乙内酰脲衍生物。获得由三个(R)-N-苯乙基硫脲和苯甲酰基甲酰氯合成的三个硫代乙内酰脲,为非对映异构体混合物。这些硫代乙内酰脲在手性中心具有氨基碳原子,这些碳原子可在适当条件下通过开环和闭环反应而被差向异构。硫代乙内酰脲的非对映混合物在少量溶剂中的悬浮液以定量方式选择性地会聚为单一非对映异构体组成的晶体。用合适的溶剂通过CIDT对一种硫代乙内酰脲的非对映选择性进行立体选择性转换。