A convenient procedure was developed for the synthesis of vicinal iodoperoxyalkanes by the reaction of alkenes with iodine and hydroperoxides. The best results were achieved with the use of excess iodine. The replacement of one iodine atom by hydroperoxides in vicinal diiodoalkanes was discovered. A suggestion was made about the reaction mechanism.
Aerobic Oxidation of Alkenes to Esters of Vicinal Diols with a<i>syn</i>-Configuration Catalyzed by I<sub>2</sub>and the H<sub>5</sub>PV<sub>2</sub>Mo<sub>10</sub>O<sub>40</sub>Polyoxometalate
作者:Ronny Neumann、Olena Branytska
DOI:10.1055/s-2005-917069
日期:——
A new method for the synthesis of vicinal diols fromalkenes has been developed. Reaction of molecular iodine in the presence of a polyoxometalate as oxidation catalyst under aerobic conditions in acetic acid solvent leads to the oxidative iodoacetoxylation of an alkene, i.e. formation of a 1,2-iodoacetate. Further in situ substitution of the iodide by water yields the 1,2-diol monoacetate with a predominantly
Eight-Step Asymmetric Synthesis of (–)-Berkelic Acid
作者:Hong-Gang Cheng、Qianghui Zhou、Zhenjie Yang、Ruiming Chen、Liming Cao、Qiang Wei、Qingqing Wang
DOI:10.1055/a-1799-0459
日期:2022.11
This work features a sequential Catellani-type reaction/oxa-Michael addition with epoxides as dual-functionalized alkylating reagents for synthesizing the isochroman framework, a one-pot, acid-catalyzed deprotection/spiroacetalization process for the construction of a tetracyclic core intermediate, and a late-stage Ni-catalyzed reductive coupling reaction for the installation of the side chain. Remarkably
我们在此报告了 (–)-berkelic 酸的八步不对称合成。这项工作的特点是连续 Catellani 型反应/oxa-Michael 加成与环氧化物作为双官能化烷基化试剂用于合成异色满框架,一锅酸催化脱保护/螺缩醛化过程用于构建四环核心中间体,以及用于安装侧链的后期 Ni 催化还原偶联反应。值得注意的是,在去保护/螺缩醛化过程中,从一个现有的手性中心创建了四个具有高立体控制的新立体中心。
Optically active compounds and a process for producing these compounds
申请人:CHISSO CORPORATION
公开号:EP0372891B1
公开(公告)日:1996-03-13
High Yield Regioselective Ring Opening of Epoxides Using Samarium Chloride Hexahydrate
作者:Kankan Bhaumik、Umesh W. Mali、K. G. Akamanchi
DOI:10.1081/scc-120018790
日期:2003.1.5
Epoxides were converted to the corresponding beta-azidohydrins and beta-iodohydrins using SmCl3.6H(2)O/NaN3 in DMF and SMCl3.6H(2)O/ NaI in acetonitrile respectively. The reactions were highly regioselective, efficient, and gave excellent yields under mild and neutral conditions.