An expedient stereoselective synthesis of (Z)- and (E)-allyl iodides from Baylis–Hillman adducts along with selective iodination of benzylic alcohols using the polymethylhydrosiloxane–iodine system
A stereoselective method has been developed for the synthesis of (Z)- and (E)-allyl iodides from Baylis–Hillman adducts using polymethylhydrosiloxane (PMHS) and iodine in chloroform at room temperature. In addition, the reagent system has been utilized for the iodination of benzylic alcohols selectively.
A mild and efficient method has been developed for the synthesis of alkyl and alkenyl iodides from alkenes and alkynes using polymethylhydrosiloxane (PMHS) and iodine in chloroform at room temperat...
Rhodium-Catalyzed Generation of Anhydrous Hydrogen Iodide: An Effective Method for the Preparation of Iodoalkanes
作者:Chaoyuan Zeng、Guoli Shen、Fan Yang、Jingchao Chen、Xuexin Zhang、Cuiping Gu、Yongyun Zhou、Baomin Fan
DOI:10.1021/acs.orglett.8b02980
日期:2018.11.2
The preparation of anhydrous hydrogen iodide directly from molecular hydrogen and iodine using a rhodium catalyst is reported for the first time. The anhydrous hydrogen iodide generated was proven to be highly active in the transformations of alkenes, phenyl aldehydes, alcohols, and cyclic ethers to the corresponding iodoalkanes. Therefore, the present methodology not only has provided convenient access
Ready access to organoiodides: Practical hydroiodination and double-iodination of carbon-carbon unsaturated bonds with I2
作者:Jing Xiao、Li-Biao Han
DOI:10.1016/j.tet.2019.05.019
日期:2019.6
By using I2 or I2/H3PO3 system, various alkenes and alkynes were converted to the corresponding alkyl and alkenyl iodides in good yields. In the presence of I2, alkynes could be di-iodinated using H2O as the solvent in air at room temperature. This method also features the simple work-up procedure since the pure product could be obtained by extraction. Additionally, for the first time, combining with
通过使用I 2或I 2 / H 3 PO 3体系,将各种烯烃和炔烃以良好的产率转化为相应的烷基碘和烯基碘。在存在I 2的情况下,可以在室温下于空气中使用H 2 O作为溶剂将炔烃二碘化。由于可以通过萃取获得纯产物,因此该方法还具有简单的后处理程序。此外,首次将无毒廉价的膦酸H 3 PO 3与烯烃和炔烃成功加氢碘化,为有机碘的合成提供了一种简单实用的方法。
Iridium-Catalyzed Hydroiodination and Formal Hydroamination of Olefins with <i>N-</i>Iodo Reagents and Molecular Hydrogen: An Umpolung Strategy
We herein report a convenient method to convert olefins to organic iodides and amines using an Ir/ZhaoPhos catalyst, molecularhydrogen, and an electrophilic iodine(I) reagent. High yields and regioselectivities were obtained under mild conditions. In addition, basic workup with potassium carbonate leads to C–N products. Control experiments and DFT calculations tentatively excluded the pathway involving