据报道,一种易于获得的有机-无机杂化催化剂用于α-卤代羰基化合物的还原断裂。稳健的杂化催化剂是 ZnCl 2 Lewis 酸和吖啶橙作为光活性有机染料的自稳定组合。已经使用光物理和电化学实验详细研究了这种混合催化剂的机械特性。一项系统的研究使我们能够发现合适的路易斯酸以有效地稳定α-卤代羰基化合物,从而降低标准有机染料范围内的还原电位。该策略通过引导光氧化还原循环通过氧化猝灭途径解决了脱卤氢化或烷基自由基同源偶联等问题。光活性有机染料和路易斯酸对应物之间的协同作用通过有效和受控地生成烷基自由基,使功能化与广泛的偶联伙伴成为可能,并作为昂贵的后过渡金属基光催化剂的合适替代品。为了证明这种协同催化体系的应用潜力,研究了四种不同的α-羰基溴的合成转化,具有广泛的底物范围。
PQS-enabled visible-light iridium photoredox catalysis in water at room temperature
作者:Mei-jie Bu、Chun Cai、Fabrice Gallou、Bruce H. Lipshutz
DOI:10.1039/c7gc03866f
日期:——
An amphoteric PQS-attached photocatalyst has been prepared that undergoes self-aggregation in water into nanomicelles. This covalently bound species enables Ir-based photoredoxcatalysis to be conducted in the absence of additives or co-solvents. Representative reactions are described using this new catalytic system, which require no additional investment of external energy in the form of heating or
Dioxygen-Triggered Oxosulfonylation/Sulfonylation of Terminal Olefins toward β-Keto Sulfones/Sulfones
作者:Yanjie Wang、Yuhan Zhao、Changqun Cai、Lingyun Wang、Hang Gong
DOI:10.1021/acs.orglett.1c03049
日期:2021.11.5
A dioxygen-triggered oxosulfonylation/sulfonylation of unactivated olefins to achieve β-keto sulfones/sulfones has been developed. Interestingly, pluralistic mechanisms were found when different types of compounds were applied as substrates, and different products were achieved. The reaction is carried out with a high atomic efficiency in the absence of a metal and a catalyst at room temperature under
A Naphthalimide-Based ND-O-EAc Photocatalyst for Sulfonation of Alkenes to Access β-Ketosulfones Under Visible Light
作者:Xiaoting Yang、Jianjing Yang、Kelu Yan、Hongyun Qin、Wenjie Dong、Jiangwei Wen、Hua Wang
DOI:10.1002/ejoc.202000423
日期:2020.6.23
The development of facile, efficient, cost-effective, and visible light-driven photocatalysts for organic synthetic chemistry has received increasing attention. This protocol has initially synthesized a naphthalimide-basedND-O-EAcvisiblelightphotocatalyst for the sulfonation of alkenes to produce ketosulfones. Compared with the current photosynthetic strategies, the newly developed catalytic system