Enediolates and dienediolates of carboxylic acids in synthesis. Synthesis of β,γ-epoxyacids from α-chloroketones
作者:Eva M. Brun、Salvador Gil、Ramon Mestres、Margarita Parra、Félix Villar
DOI:10.1016/s0040-4039(97)10726-2
日期:1998.2
Lithium dienolates of saturated or α,β-unsaturated acids react with α-chloroketones provide a convenient method for preparation of highly sustituted β,γ-epoxyacids. These highly reactive compounds lead in most cases to variable ammounts of the corresponding β-lactones and allylic alcohols.
Polymethylhydrosiloxane reduction of carbonyl function catalysed by titanium tetrachloride
作者:N. D. Jumbam、S. Makaluza、W. Masamba
DOI:10.4314/bcse.v32i1.18
日期:——
ketones into the corresponding methylene derivatives by polymethylhydrosiloxane in the presence of titanium tetrachloride as catalyst was achieved in good to excellent yields ranging from 55-90%. The reaction took place under relatively mild conditions and smoothly led to the desired target molecules in the presence of other functional groups such as halogens, hydroxyl, nitro and methoxy groups. However
Synthesis of 9-bromocotarnine and its recyclization into 4-acyl-9-bromo-7,8-methylenedioxy-1,2-dihydro-3-benzazepines with anti-infective activity
作者:A. A. Zubenko、L. N. Divaeva、A. S. Morkovnik、V. G. Kartsev、Y. D. Drobin、N. M. Serbinovskaya、L. N. Fetisov、A. N. Bodryakov、M. A. Bodryakova、L. A. Lyashenko
DOI:10.1134/s1068162017030189
日期:2017.5
form has been obtained by the interaction of cotarnine with bromine. The reaction of 9-bromocotarnine with α-haloketones is accompanied by the extension of the six-membered hetero-ring to seven-memberedring and led to previously unknown 4-acyl-9-bromo-3-methyl-6-methoxy-7,8-methylendioxy-1,2-dihydro-3-benzazepines. Some of these compounds have been shown to have only moderate antibacterial (against
With SmI3 as the Lewis acid and catalyzed by CuI in DMF, α-haloketones were transformed unexpectedly into α-hydroxy-1,4-diketones in good to moderate yields. The mechanism was probed and a plausible reaction pathway was proposed. DMF was assumed to play a dual role both as a hydroxyl source and as a solvent.
[EN] IMPROVED PROCESSES FOR PREPARATION OF BILASTINE USING NOVEL INTERMEDIATES<br/>[FR] PROCÉDÉ AMÉLIORÉ DE PRÉPARATION DE BILASTINE À L'AIDE DE NOUVEAUX INTERMÉDIAIRES
申请人:SYMED LABS LTD
公开号:WO2018042305A1
公开(公告)日:2018-03-08
Provided herein are improved, commercially viable and industrially advantageous processes for the preparation of Bilastine or a pharmaceutically acceptable salt thereof using novel intermediates, in high yield and purity.