碱性胺是许多具有生物活性的天然产物和药物的关键元素。鉴于其固有的反应性,在靶向合成过程中通常需要保护碱性胺,这会导致保护/脱保护序列的浪费。我们报告了一种分步经济的方法,能够在仲胺通过 CO 2的正式挤出转化为叔胺之前将其保护为氨基甲酸酯。该方法适用于 iboga 生物碱 (±)-conodusine A 和 (±)-conodusine B 的合成。
[EN] NEW PROCESS FOR THE SYNTHESIS OF TAPENTADOL AND INTERMEDIATES THEREOF<br/>[FR] NOUVEAU PROCÉDÉ POUR LA SYNTHÈSE DE TAPENTADOL ET SES INTERMÉDIAIRES
申请人:ARCHIMICA SRL
公开号:WO2012001571A1
公开(公告)日:2012-01-05
The object of the present invention is a new process for the synthesis of tapentadol, both as free base and in hydrochloride form, which comprises the step of alkylation of the ketone (VII) to yield the compound (VIII), as reported in Diagram 1, with high stereoselectivity due to the presence of the benzyl group as substituent of the amino group. It was surprisingly found that this substitution shifts the keto-enol equilibrium towards the desired enantiomer and amplifies the capacity of the stereocenter present in the compound (VII) to orient the nucleophilic addition of the organometallic compound at the carbonyl towards the desired stereoisomer. This substitution thus allows obtaining a considerable increase of the yields in this step, and consequently allows significantly increasing the overall yield of the entire tapentadol synthesis process. A further object of the present invention is constituted by the tapentadol free base in solid form, obtainable by means of the process of the invention. Still another object of the invention is represented by the crystalline forms I and II of the tapentadol free base. A further object of the present invention is the mixture of the crystalline forms I and II of the tapentadol free base.
Substituenteneinfluss bei der massenspektrometrischen Fragmentierung: Untersuchungen an N-methyl-?,??-diphenyl-di�thylaminen. 19. Mitteilung �ber das massenspektrometrische Verhalten von Stickstoffverbindungen
作者:Peter A. Weibel、Manfred Hesse
DOI:10.1002/hlca.19730560728
日期:1973.11.7
Some different substituted N-methyl-β,β′-diphenyl-diethylamines (I) were investigated mass spectrometrically. The main fragmentations and their genesis are summarized in Scheme 2. The molecular ion generates the major fragmentions a (m/e 148) and b (m/e (147 + X)); c (m/e 105) is formed from a and d (m/e (104+X)) from b by further decomposition. The logarithms of the ratios of the relative ion intensities
Characterization of Route Specific Impurities Found in Methamphetamine Synthesized by the Leuckart and Reductive Amination Methods
作者:Vanitha Kunalan、Niamh Nic Daéid、William J. Kerr、Hilary A. S. Buchanan、Allan R. McPherson
DOI:10.1021/ac9005588
日期:2009.9.1
Impurity profiling of seized methamphetamine can provide very useful information in criminal investigations and, specifically, on drug trafficking routes, sources of supply, and relationships between seizures. Particularly important is the identification of “route specific” impurities or those which indicate the synthetic method used for manufacture in illicit laboratories. Previous researchers have
Method for preparing high purity diphenyl carbonate
申请人:MITSUBISHI GAS CHEMICAL COMPANY, INC.
公开号:EP0722931A1
公开(公告)日:1996-07-24
A method for preparing a high purity diphenyl carbonate. The diphenyl carbonate is distilled in the presence of a basic substance. The present invention provides high purity diphenyl carbonate using a simple method. A high molecular aromatic polycarbonate containing substantially no polymerization inhibitor and without coloring is easily prepared from the purified diphenyl carbonate.
PROCESS FOR THE SYNTHESIS OF TAPENTADOL AND INTERMEDIATES THEREOF
申请人:Motta Giuseppe
公开号:US20130178644A1
公开(公告)日:2013-07-11
The object of the present invention is a new process for the synthesis of tapentadol, both as free base and in hydrochloride form, which comprises the step of alkylation of the ketone (VII) to yield the compound (VIII), as reported in Diagram 1, with high stereoselectivity due to the presence of the benzyl group as substituent of the amino group. It was surprisingly found that this substitution shifts the keto-enol equilibrium towards the desired enantiomer and amplifies the capacity of the stereocenter present in the compound (VII) to orient the nucleophilic addition of the organometallic compound at the carbonyl towards the desired stereoisomer. This substitution thus allows obtaining a considerable increase of the yields in this step, and consequently allows significantly increasing the overall yield of the entire tapentadol synthesis process.
A further object of the present invention is constituted by the tapentadol free base in solid form, obtainable by means of the process of the invention.
Still another object of the invention is represented by the crystalline forms I and II of the tapentadol free base.
A further object of the present invention is the mixture of the crystalline forms I and II of the tapentadol free base.