Aliphatic C–H Bond Iodination by a <i>N</i>-Iodoamide and Isolation of an Elusive <i>N</i>-Amidyl Radical
作者:Alexander Artaryan、Artur Mardyukov、Kseniya Kulbitski、Idan Avigdori、Gennady A. Nisnevich、Peter R. Schreiner、Mark Gandelman
DOI:10.1021/acs.joc.7b00557
日期:2017.7.21
Contrary to C–H chlorination and bromination, the direct iodination of alkanes represents a great challenge. We reveal a new N-iodoamide that is capable of a direct and efficient C–H bond iodination of various cyclic and acyclic alkanes providing iodoalkanes in good yields. This is the first use of N-iodoamide for C–H bond iodination. The method also works well for benzylic C–H bonds, thereby constituting
Direct Bromination and Iodination of Non-Activated Alkanes by Hypohalite Reagents
作者:Thomas Wirth、Raúl Montoro
DOI:10.1055/s-2005-865322
日期:——
The direct functionalisation of alkanes through bromination and iodination has been successfully achieved. The combination of stoichiometric mixtures of elemental halogen and sodium alkoxides leads to the formation of alkyl hypobromites and hypoiodites as reagents. The halogenation occurs without external photostimulation under thermal reaction conditions.
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...
A New Coupling Reaction of Alkyl Iodides with Electron Deficient Alkenes Using Nickel Boride (cat.)−Borohydride Exchange Resin in Methanol
作者:Tae Bo Sim、Jaesung Choi、Meyoung Ju Joung、Nung Min Yoon
DOI:10.1021/jo961751f
日期:1997.4.1
addition reaction of alkyliodides with alpha,beta-unsaturated esters, nitriles, and ketones proceeds in moderate to excellent yields (50-95%) using Ni(OAc)(2) (0.05-0.2 equiv)-BER (3-5 equiv) in methanol in 1-9 h at room temperature or at 65 degrees C. Nickel boride on borohydride exchange resin (BER) is a good alternative reagent to tributyltin hydride for the coupling of alkyliodides with the electron
PROCESSES FOR PREPARING 2-ISOPROPENYL-5-METHYL-4-HEXENOIC ACID, 2-ISOPROPENYL-5-METHYL-4-HEXEN-1-OL, AND A CARBOXYLATE ESTER THEREOF
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:US20210323902A1
公开(公告)日:2021-10-21
The present invention provides a process for preparing 2-isopropenyl-5-methyl-4-hexenoic acid of the following formula (4), comprising steps of:
subjecting a Grignard reagent of the following general formula (1), wherein R
1
represents a linear, branched, or aromatic monovalent hydrocarbon group having 1 to 8 carbon atoms, and X represents a chlorine atom, a bromine atom, or an iodine atom, and 1,1,1,3,3,3-hexamethyldisilazane to a deprotonation reaction to form a 1,1,1,3,3,3-hexamethyldisilazane derivative; and subjecting 2-methyl-3-buten-2-yl 3-methyl-2-butenoate of the following formula (3) to a rearrangement reaction in the presence of the 1, 1, 1,3,3,3-hexamethyldisilazane derivative to form 2-isopropenyl-5-methyl-4-hexenoic acid (4).