A procedure for the continuous flow generation of thiomorpholine in a two-step telescoped format was developed. The key step was the photochemical thiol–ene reaction of cysteamine hydrochloride and vinyl chloride as low-cost starting materials. This reaction could be conducted under highly concentrated (4 M) conditions using a low amount (0.1–0.5 mol %) of 9-fluorenone as the photocatalyst, leading
开发了一种以两步伸缩格式连续流动生成
硫代吗啉的程序。关键步骤是
半胱胺盐酸盐和
氯乙烯作为低成本起始材料的光
化学硫醇-烯反应。该反应可以在高浓度 (4 M) 条件下使用少量 (0.1-0.5 mol%) 的
9-芴酮作为光催化剂进行,从而产生相应的定量产率的半芥末中间体。随后通过碱介导的环化获得
硫代吗啉。通过进行 7 小时(总停留时间 40 分钟)的反应,通过蒸馏分离所需的
硫代吗啉,证明了该方法的稳健性。