A RhIII‐catalyzed intramolecularoxidative cross‐coupling between double bonds for the synthesis of macrolides is described. Under the optimized reaction conditions, macrocycles containing a diene moiety can be formed in reasonable yields and with excellent chemo‐ and stereoselectivity. This method provides an efficient approach to synthesize macrocyclic compounds containing a 1,3‐conjugated diene
A transition-metal-free Heck-type reaction between alkenes and alkyl iodides enabled by light in water
作者:Wenbo Liu、Lu Li、Zhengwang Chen、Chao-Jun Li
DOI:10.1039/c5ob00515a
日期:——
A transition-metal-free coupling protocol between various alkenes and non-activated alkyl iodides has been developed by using photoenergy in water for the first time. Under UV irradiation and basic aqueous conditions, various alkenes efficiently couple with a wide range of non-activated alkyl iodides. A tentative mechanism, which involves an atom transfer radical addition process, for the coupling
The Synthesis of α-Azidoesters and Geminal Triazides
作者:Philipp Klahn、Hellmuth Erhardt、Andreas Kotthaus、Stefan F. Kirsch
DOI:10.1002/anie.201402433
日期:2014.7.21
representatives of this novel class of triazide compounds: Despite their high nitrogen content, the geminaltriazides are easy to handle, even when preparative‐scale syntheses are performed. (Caution: These procedures still require protective measures!) The triazides are now broadly available for further studies regarding their properties and reactivity. Furthermore, we show how the method can be used to
A mild and highly chemoselective iodination of alcohol using polymer supported DMAP
作者:DIPARJUN DAS、JASHA MOMO H ANAL、LALTHAZUALA ROKHUM
DOI:10.1007/s12039-016-1158-1
日期:2016.11
supported DMAP is used in catalytic amount and is recovered and reused several times. Additionally, this method is highly chemoselective. A mild and highly selective iodination of alcohols using polymer supported 4-(Dimethylamino)pyridine (DMAP) in catalytic amount is reported. The basecatalyst can be easily recovered by simple filtration and reused several times without appreciable loss in activity.
Toward a molecular-size tinkertoy construction set. Preparation of terminally functionalized [n]staffanes from [1.1.1]propellane
作者:Piotr Kaszynski、Andrienne C. Friedli、Josef Michl
DOI:10.1021/ja00028a029
日期:1992.1
of [n]staffanes (the oligomers of [1.1.1]propellanen=1-5) functionalized on one or both ends is described,and their properties are summarized. The substituents are -COOCH 3 ,-n-C 4 H 9 ,-C 6 H 5 ,-Br,-I and -SCOCH 3 , and their conversion to others,such as -COOH, -COCH 3 and -SH,is demonstrated. it is proposed that these rod-shaped molecules will be useful in the development of a molecular-size civil
描述了一种在一端或两端官能化的 [n]staffanes([1.1.1]propellane 的低聚物 n=1-5)的简便但低场合成,并总结了它们的性质。取代基为-COOCH 3 、-nC 4 H 9 、-C 6 H 5 、-Br、-I 和-SCOCH 3 ,并证明了它们向其他取代基如-COOH、-COCH 3 和-SH 的转化。建议这些棒状分子将有助于开发类似于儿童玩具建筑套装的分子大小的土木工程建筑套装