Heterogeneous Carbon Nitrides Photocatalysis Multicomponent Hydrosulfonylation of Alkynes To Access β-Keto Sulfones with the Insertion of Sulfur Dioxide in Aerobic Aqueous Medium
作者:Bangqing Ni、Binbin Zhang、Jine Han、Bohan Peng、Yuling Shan、Tengfei Niu
DOI:10.1021/acs.orglett.9b04454
日期:2020.1.17
Although hydrosulfonylation of alkynes is an ideal process to generate β-keto sulfones, such an approach is rarely implemented. Here we reported a facile and efficient graphitic carbon nitride (p-g-C3N4) photocatalyzed hydrosulfonylation of alkynes with the insertion of sulfur dioxide in aerobic conditions. Controlled experiments and ESR results indicated both the superoxide radicals and valence band
尽管炔烃的氢磺酰化是生成β-酮砜的理想方法,但这种方法很少采用。在这里,我们报道了一种在有氧条件下插入二氧化硫的简便有效的石墨碳氮化碳(pg-C3N4)光催化炔烃的加氢磺酰化反应。对照实验和ESR结果表明,超氧自由基和价带孔均在反应中起重要作用。进一步的同位素实验证实了产物的氧原子来自H2O,而O2通过淬灭DABCO自由基阳离子在反应中起重要作用。无金属的异质半导体可完全回收至少6次,而没有明显的还原活性。此外,