is one of the most attractive catalysts, especially for aromatic C–H functionalizations. However, stoichiometric amounts of oxidants and strong carbanions are required, and C–H tertiary alkylation, especially with electron-deficient alkylgroups, is unexplored. In this paper, we describe the development of iron-catalyzed selective C–H tertiary alkylations with heteroaromatics, in which an iron salt
Organo-photoredox-Catalyzed Atom-Transfer Radical Substitution of Alkenes with α-Carbonyl Alkyl Halides
作者:Goki Hirata、Taisei Shimada、Takashi Nishikata
DOI:10.1021/acs.orglett.0c03359
日期:2020.11.20
(ATRS) and carboesterification reaction of alkenes with alkyl halides has been developed using PTH as the organo-photoredox catalyst. Two types of products were obtained, depending on the additive and solvent used during the reaction. Primary, secondary, and tertiary alkyl halides reacted to give the ATRS products. This protocol has several advantages: it requires mild reaction conditions and a low catalyst
2‐Propyl‐2‐pentenoic acid was prepared. Its stereochemistry was determined using the A.S.I.S.‐effect. The dehalogenation by N,N‐diethylaniline of some N‐substituted 2‐bromo‐2,2‐dipropyl‐acetamides gave the corresponding unsaturated amides. The configurations of these compounds are discussed on the basis of NMR data obtained with and without complexation with tris(dipivaloylmethano)europium [Eu (DPM)3]
Process for preparing (E)-2-propyl-2-pentenoic acid and intermediate
申请人:Elf Sanofi
公开号:US05262561A1
公开(公告)日:1993-11-16
Composition consisting of a mixture of (E) and (Z) isomers of esters of general formula: ##STR1## in which R represents a C.sub.1 -C.sub.4 alkyl radical, containing at least 85% of (E) isomer. A process for preparing such a composition. The use of such a composition for preparing (E)-2-propyl-2-pentenoic acid of formula: ##STR2## and also its pharmaceutically acceptable salts.
Process for the preparation of E-2-propyl-2-pentenoic acid and
申请人:Desitin Arznemittel GmbH
公开号:US04966996A1
公开(公告)日:1990-10-30
A novel process for the preparation of E-2-propyl-2-pentenoic acid, as well as the physiologically compatible salts thereof is described, in which 2-bromo-2-propyl-pentenoic acid ethyl ester is used as the starting compound. The bromine is split off with a cyclic tertiary amine in acetonitrile as the solvent and preferably the E-isomer of the ethyl ester is formed. The free acid is obtained by subsequent saponification under careful conditions and optionally, preferably using the corresponding carbon dioxide salts in aqueous acetone solution, is converted into the salt form.