AbstractA strategy for anti‐Markovnikov hydroalkyl/aryl thiolation and disulfidation of 2‐azetines under continuous flow conditions has been developed. Thiyl radicals are generated from thiols or disulfides and subsequently propagate into the azetine unsaturation to forge the C−S bond and shape a secondary radical intermediate. This carbon‐centered radical chain transfers to another thiol via hydrogen atom transfer (HAT) or another disulfide to regenerate the key thiyl radical intermediates. The use of flow technology ensures efficient irradiation of the reaction mixture leading to extremely fast, robust, and scalable protocols. Furthermore, ethyl acetate was adopted as an environmentally responsible solvent.
摘要 开发了一种在连续流动条件下对 2-氮杂环丁烷进行反马尔科夫尼科夫氢烷基/芳基硫代和二硫化反应的策略。硫基从硫醇或二硫化物中生成,随后传播到氮杂环丁烷的不饱和状态中,形成 C-S 键并形成二级自由基中间体。这种以碳为中心的自由基链通过氢原子转移(HAT)转移到另一个硫醇或另一个二硫化物上,从而再生出关键的硫自由基中间体。流动技术的使用确保了反应混合物的高效辐照,从而实现了极其快速、稳健和可扩展的方案。此外,还采用了对环境负责的乙酸乙酯溶剂。