K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> activation by glucose at room temperature for the synthesis and functionalization of heterocycles in water
作者:Joydev K. Laha、Mandeep Kaur Hunjan
DOI:10.1039/d1cc03777c
日期:——
sulfate radical anion, the utilization of this protocol in organic synthesis is rarely demonstrated. We reinvestigated selected K2S2O8-mediated known organic reactions that invariably require higher temperatures and an organic solvent. A diverse, mild functionalization and synthesis of heterocycles using the inexpensive oxidant K2S2O8 in water at room temperature is reported, demonstrating the sustainability
虽然在室温下使用葡萄糖进行过硫酸盐活化主要集中在硫酸根阴离子的动力学研究上,但很少证明该协议在有机合成中的应用。我们重新研究了选定的 K 2 S 2 O 8介导的已知有机反应,这些反应总是需要更高的温度和有机溶剂。据报道,在室温下,使用廉价的氧化剂 K 2 S 2 O 8在水中对杂环进行了多样化、温和的功能化和合成,证明了该方法的可持续性和广泛的范围。与用于过硫酸盐活化的传统方法不同,当前方法使用天然丰富的葡萄糖作为 K 2S 2 O 8活化剂,避免使用高温、紫外线、过渡金属或碱。
TBHP/TFA mediated oxidative cross-dehydrogenative coupling of N-heterocycles with aldehydes
作者:Jiayu Chen、Miao Wan、Jing Hua、Yi Sun、Zheng Lv、Wei Li、Lei Liu
DOI:10.1039/c5ob01763g
日期:——
A metal-free oxidative cross-dehydrogenative coupling of N-heterocycles with diverse aldehydes has been established in the presence of TBHP/TFA.
Polar effects in free-radical reactions. A novel homolytic acylation of heteroaromatic bases by aerobic oxidation of aldehydes, catalysed by<i>N</i>-hydroxyphthalimide and Co salts
A new process for the homolytic acylation of protonated heteroaromatic bases is described; an N-oxyl radical (PINO) generated from N-hydroxyphthalimide by air oxygen and Co(II) abstracts a hydrogen atom from an aldehyde. The resulting nucleophilicacylradical adds to a heteroaromatic base, which is then rearo-matised in a chain process. Quinazoline has an anomalous behaviour, giving 3H-quinazolin-4-one
Visible-light-mediated metal-free decarboxylative acylation of electron-deficient quinolines using α-ketoacids under ambient air
作者:Zhongqi Zheng、Yongdi Wu、Xuelian Lu、Fang-Lin Zhang、Mei-Fang Qi、Enjie Sun、Bing Sun
DOI:10.1016/j.tet.2022.132749
日期:2022.4
A visible-light-promoted metal-free decarboxylative coupling protocol for the acylation of electron-deficient quinolines using ambient air as an oxidant has been disclosed. This environmental-friendly protocol takes place under mild conditions and is highlighted by using inexpensive photocatalyst and starting materials, thereby integrating C–H functionalization and recent photoredox scenario based