Catalytic Synthesis of Cyclic Guanidines via Hydrogen Atom Transfer and Radical-Polar Crossover
作者:Shunya Ohuchi、Hiroki Koyama、Hiroki Shigehisa
DOI:10.1021/acscatal.0c05359
日期:2021.1.15
because of a lack of efficient preparation strategies and low yield. Herein, a catalytic synthetic method for cyclic guanidines was developed via transition-metal hydrogen atom transfer and radical-polar crossover. This mild and functional-group-tolerant process enabled the cyclization of alkenyl guanidines bearing common protective groups, such as Cbz and Boc groups. This powerful method provided not only
环状胍存在于许多生物活性化合物和天然产物中。此外,由于缺乏有效的制备策略和低产率,环状胍的非典型七元环的形成仍然具有挑战性。在此,通过过渡金属氢原子转移和自由基-极性穿越发展了一种催化合成环胍的方法。这种温和且耐官能团的过程使带有常见保护基团(例如Cbz和Boc基团)的烯基胍环化。这种强大的方法不仅提供了典型的五元和六元环,而且还提供了非典型的七元环。产品的衍生化提供了各种杂环。