A simple, efficient, and highly selective method for the iodination of alcohols using ZrCl4/NaI
摘要:
Iodination of primary, secondary, allylic, and benzylic alcohols giving their corresponding iodides was achieved with ZrCl4/NaI in anhydrous CH3CN with excellent yields and selectivities. (C) 2004 Elsevier Ltd. All rights reserved.
propargylic position resemble the sidechain present at the Cα of amino acids. Whereas propargylamines with (cyclo)alkyl substituents can be prepared in a direct manner, residues with polar functional groups require suitable protective groups. The presence of particular functional groups in the sidechain in some cases leads to remarkable side reactions of the alkyne moiety. Thus, electron-withdrawing substituents
From organocatalysed desilylations to high-yielding benzylidenations of electron-deficient benzaldehydes
作者:Qun Niu、Linlin Xing、Chunbao Li
DOI:10.3184/174751917x14955339414758
日期:2017.6
A newtype of organoprecatalyst (MeSCH2Cl/KI) for desilylation and benzylidenation reactions has been designed. Both reactions are user friendly and high yielding (71–>99%) and have fast reaction rates. The desilylation of iodo silylethers was achieved with no sequential etherification side reactions like those seen for reactions when using TBAF. In the application of the catalytic system to a 6-TBDMS
HYDROXYL GROUP-CONTAINING AMINE-BASED SULFUR DIOXIDE AND SULFUROUS ACID ABSORBENT, AND METHOD FOR PREPARING THE SAME
申请人:KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
公开号:US20200155997A1
公开(公告)日:2020-05-21
The present disclosure relates to a hydroxyl group-containing amine-based sulfur dioxide and sulfurous absorbent, and a method for preparing the same. The absorbent uses an ionic liquid in the form of a salt including a diamine compound substituted with a hydroxyl group, and can be used as an absorbent capable of removing not only sulfur dioxide (SO
2
) but also sulfurous acid (H
2
SO
3
) formed by combination of sulfur dioxide with water.
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
Tylophorine and cryptopleurine were synthesized by condensation of metallated α-aminonitriles with bromomethylphenanthrenes to provide fully substituted α-aminonitriles, which are subjected to a reductive decyanation to form homobenzylic amines. From these intermediates, the E- and D-rings of tylophorine and cryptopleurine were formed through the displacement of a terminal leaving group and by a late
Tylophorine 和 cryptopleurine 是通过金属化的 α-氨基腈与溴甲基菲缩合得到完全取代的 α-氨基腈合成的,然后进行还原脱氰以形成高苄胺。从这些中间体中,分别通过末端离去基团的置换和晚期 Pictet-Spengler 缩合形成 tylophorine 和 cryptopleurine 的 E 和 D 环。