A NOVEL APPROACH TO THE SYNTHESIS OF 2-ARYL PROPIONATES
摘要:
A two step conversion of phenyl glyoxylates to 2-aryl-propionates has been accomplished. Esters of phenylglyoxylic acid have been converted to corresponding beta,beta-dichlorostyrenes. These on further reduction gave esters of 2-arylpropionic acids.
从苯乙醛酸甲酯开始,提出了一种方便的四步制备路线,用于制备新型7-氯-咪唑并[2,1- b ] [1,3]噻嗪-5-酮。该合成的独特特征是杂环化策略,其中在闭环过程中已经引入了卤素原子。通过该方法可获得在苯基和咪唑部分中具有广泛的各种取代基的7-氯-6-苯基-咪唑并噻嗪酮,以及不同的氯化三唑并噻嗪酮。在亲核取代反应中,氯官能团很容易被氨基,烷氧基和芳硫基以及氟原子取代。
An enantioselective, catalytic trichloromethylation of 2-acyl imidazoles and 2-acylpyridines is reported. Several products are formed with enantiomeric excess of ≥99%. In this system, a chiral iridium complex serves a dual function, as a catalytically active chiral Lewis acid and simultaneously as a precursor for an in situ assembled visible-light-triggered photoredox catalyst.
First synthesis and further functionalization of 7-chloro-imidazo[2,1-b][1,3]thiazin-5-ones
作者:Clemens Lamberth、Florian Querniard
DOI:10.1016/j.tetlet.2008.02.014
日期:2008.3
A convenient four-step preparation route to novel 7-chloro-imidazo[2,1-b][1,3]thiazin-5-ones is presented, starting from methyl phenylglyoxylate. A unique feature of this synthesis is a heterocyclization strategy, in which a halogen atom is introduced already during the ring closure. 7-Chloro-6-phenyl-imidazothiazinones with a broad range of various substituents in the phenyl and imidazole moieties
从苯乙醛酸甲酯开始,提出了一种方便的四步制备路线,用于制备新型7-氯-咪唑并[2,1- b ] [1,3]噻嗪-5-酮。该合成的独特特征是杂环化策略,其中在闭环过程中已经引入了卤素原子。通过该方法可获得在苯基和咪唑部分中具有广泛的各种取代基的7-氯-6-苯基-咪唑并噻嗪酮,以及不同的氯化三唑并噻嗪酮。在亲核取代反应中,氯官能团很容易被氨基,烷氧基和芳硫基以及氟原子取代。
A NOVEL APPROACH TO THE SYNTHESIS OF 2-ARYL PROPIONATES
作者:D. V. Patil、M. S. Wadia
DOI:10.1081/scc-120006466
日期:2002.1
A two step conversion of phenyl glyoxylates to 2-aryl-propionates has been accomplished. Esters of phenylglyoxylic acid have been converted to corresponding beta,beta-dichlorostyrenes. These on further reduction gave esters of 2-arylpropionic acids.
Tris(pentafluorophenyl)borane‐Catalyzed Oxygen Insertion Reaction of
<i>α</i>
‐Diazoesters (α‐Diazoamides) with Dimethyl Sulfoxide
A tris(pentafluorophenyl)borane-catalyzed oxidation reaction of α-diazoesters (α-diazo amides) with dimethyl sulfoxide has been developed. The reaction proceeds under metal free conditions to afford a series α-ketoesters and α-ketoamides. The synthetic utility of this protocol is demonstrated through synthetic transformations and scaled-up synthesis.