A Practical, Two-Step Synthesis of 2-Substituted 1,3-Butadienes
摘要:
A two-step procedure for preparing 2-alkyl-1,3-butadienes is described. Cuprate addition to commercially available 1,4-dibromo-2-butene yields 3-alkyl-4-bromo-1-butene, a product Of S(N)2' substitution. Dehydrohalogenation gives 2-alkyl-1,3-butadienes.
Synthesis of Homoallylic Alcohols with Acyclic Quaternary Centers through Co
<sup>III</sup>
‐Catalyzed Three‐Component C−H Bond Addition to Internally Substituted Dienes and Carbonyls
作者:Sun Dongbang、Zican Shen、Jonathan A. Ellman
DOI:10.1002/anie.201906633
日期:2019.9.2
substituted dienes and a wide range of aldehydes and activated ketones. Isoprene and other internally monosubstituted dienes are effective inputs, with the reaction proceeding with high diastereoselectivity for those substrate combinations that result in more than one stereogenic center. Moreover, the opposite relative stereochemistry can be achieved by employing 1,2-disubstituteddienes. A mechanism
[EN] PROCESS FOR MAKING A CONJUGATED DIENE FROM AN ALLYL ALCOHOL<br/>[FR] PROCÉDÉ DE FABRICATION D'UN DIÈNE CONJUGUÉ À PARTIR D'UN ALCOOL D'ALLYLE
申请人:GIVAUDAN SA
公开号:WO2021255052A1
公开(公告)日:2021-12-23
An in-situ method for making a conjugated diene from an allyl alcohol comprising the conversion of the allyl alcohol to an allyl carbonate, allyl ester or allyl formate with concomitant or subsequent conversion of the allyl carbonate, allyl ester or allyl formate to the conjugated diene; the products obtained by said method, and the uses of said products.
[EN] CYCLOHEXENE- AND CYCLOPROPANATED CYCLOHEXENE - DERIVATIVES AS FRAGRANCES<br/>[FR] DÉRIVÉS DE CYCLOHEXÈNE ET DE CYCLOHEXÈNE CYCLOPROPANÉ SERVANT DE PARFUMS
申请人:GIVAUDAN SA
公开号:WO2012020076A1
公开(公告)日:2012-02-16
1-(3/4-isobutyl-1/6-methylcyclohex-3-enyl)methanols and derivatives thereof having appreciable floral and hesperidic odor notes, their use as fragrance ingredient and perfumed products comprising them.
Cyclohexene- And Cyclopropanated Cyclohexene- Derivatives As Fragrances
申请人:Bajgrowicz Jerzy A.
公开号:US20130303433A1
公开(公告)日:2013-11-14
1-(3/4-isobutyl-1/6-methylcyclohex-3-enyl)methanols and derivatives thereof having appreciable floral and hesperidic odor notes, their use as fragrance ingredient and perfumed products comprising them.
Synthesis of Nitrile Bearing Acyclic Quaternary Centers through Co(III)‐Catalyzed Sequential C−H Bond Addition to Dienes and
<i>N</i>
‐Cyanosuccinimide
作者:Sun Dongbang、Jonathan A. Ellman
DOI:10.1002/anie.202010735
日期:2021.1.25
quaternary centers bearing nitriles by cobalt‐catalyzed C−H bond activation and sequential addition to internally substituted 1,3‐dienes and an electrophilic cyanating reagent with high regio and stereocontrol. 2‐Aryl and alkyl monosubstituted dienes provide α‐aryl and α‐alkyl α‐methyl‐substituted nitriles, respectively. An even wider variety of functionality can be installed at the quaternary carbon by