An unprecedentedly straightforward electro-oxidative coupling of sulfides with activated methylene compounds to synthesize sulfur ylides has been developed. Good to excellent yields can be obtained under catalyst- and oxidant-free conditions at room temperature. Owing to the use of continuous-flow electrochemical setups, this green, mild and practical electrosynthesis features high efficiency and excellent
Gold‐catalyzed C−H Functionalization of Phenothiazines with Aryldiazoacetates
作者:Sripati Jana、Claire Empel、Chao Pei、Thanh Vinh Nguyen、Rene M. Koenigs
DOI:10.1002/adsc.202000962
日期:2020.12.22
motif in pharmaceuticals and advanced functional organic materials. However, the C−H functionalization reaction of N‐protected phenothiazine is rather unexplored and often shadowed by its chemical reactivity on the heteroatomic centers, which limits the diversity of its potential applications. This report demonstrates a straightforward approach towards the site‐selective C−H functionalization of phenothiazine
substituents of these N-phenylphenothiazines shift the estimated excited state reduction potential up to -3.0 V (vs SCE). These highly reducing properties allow the addition of methanol to α-methylstyrene as less-activated substrate for this type of reaction. Without the help of an additive, the reaction conditions were optimized to achieve a quantitative yield for the Markovnivkov-type addition product after
Force‐Induced Turn‐On Persistent Room‐Temperature Phosphorescence in Purely Organic Luminogen
作者:Jia Ren、Yunsheng Wang、Yu Tian、Zhenjiang Liu、Xiangheng Xiao、Jie Yang、Manman Fang、Zhen Li
DOI:10.1002/anie.202101994
日期:2021.5.25
Research of purely organicroom‐temperaturephosphorescence (RTP) materials has been a hot topic, especially for those with stimulus response character. Herein, an abnormal stimulus‐responsive RTP effect is reported, in which, purely organicluminogen of Czs‐ph‐3F shows turn‐on persistentphosphorescence under grinding. Careful analyses of experimental results, coupled with the theoretical calculations
disclose a novel self-catalytic photochemical sulfonylation of phenothiazines, in which phenothiazine functions as both a substrate and a photosensitizer. The reaction proceeds under visible-light irradiation without an extra photocatalyst and additives and presents a green synthetic approach to access valuable mono- and di-sulfonylated phenothiazines. This late-stage modification process massively enriches