PROCESS FOR PRODUCING PHENYL-SUBSTITUTED HETEROCYCLIC DERIVATIVE THROUGH COUPLING USING TRANSITION METAL CATALYST
申请人:Komiyama Masato
公开号:US20110313169A1
公开(公告)日:2011-12-22
A process for efficiently producing, through few steps either a xanthine oxidase inhibitor, which is a therapeutic agent for hyperuricemia, or an intermediate therefore. The process is a novel coupling process which comprises subjecting a compound represented by formula (1) to coupling reaction with a compound represented by formula (2) in the presence of a transition metal compound to thereby obtain a compound represented by formula (3).
[EN] PROCESSES FOR THE PREPARATION OF A BACE INHIBITOR<br/>[FR] PROCÉDÉS POUR LA PRÉPARATION D'UN INHIBITEUR DE BACE
申请人:MERCK SHARP & DOHME
公开号:WO2016025359A1
公开(公告)日:2016-02-18
This invention provides processes for the preparation of verubecestat (Compound of Formula (I)), a potent inhibitor of BACE-1 and BACE-2. In addition, the invention provides certain synthetic intermediates which are useful, among other things, for the preparation of the Compound of Formula (I).
Palladium-Catalyzed Formylation of Aryl Bromides: Elucidation of the Catalytic Cycle of an Industrially Applied Coupling Reaction
作者:Alexey G. Sergeev、Anke Spannenberg、Matthias Beller
DOI:10.1021/ja804997z
日期:2008.11.19
[Pd(Br)(p-CF3C6H4CO)P(1-Ad)2(n)Bu}]2 (8), under mild conditions (25-50 degrees C, 5 bar). Stoichiometric studies using the less efficient Pd/P(t)Bu3 catalyst resulted in the isolation and characterization of the first stable three-coordinated neutral acylpalladium complex, [Pd(Br)(p-CF3C6H4CO)(P(t)Bu3)] (10). Hydrogenolysis of 10 needed significantly more drastic conditions compared to that of dimeric 8. In the presence
Configurational effects in the α-scission of phosphoranyl radicals
作者:John W. Cooper、Brian P. Roberts
DOI:10.1039/p29760000808
日期:——
is present as the number of ethoxy-ligands increases. However, if configurational effects are absent, changing the nature of the alkoxy-substituents in a phosphoranylradical has only a small effect on the rate of its α-scission. The equatorial P–C bond dissociation enthalpy of MeṖ(OPri)3 is found to be ca.+29 kJ mol–1. The radicals Me3ṖOR (R = Et, But, t-pentyl) undergo exchange of apical and equatorial