Synthesis of derivatives of prenylacetic acids by reactions of alkyl malonate, cyanoacetate, and acetoacetate with alkylating reagents in ionic liquids
作者:G. V. Kryshtal、G. M. Zhdankina、S. G. Zlotin
DOI:10.1023/b:rucb.0000035652.61455.b9
日期:2004.3
A method for the synthesis of carboxylic acid derivatives containingone or two —CH2CHn(Me)CHn+1CH2— fragments (n = 0, 1) was developed. The method is based on the alkylation of (di)alkyl malonates, cyanoacetates, and acetoacetates with acyclic prenyl halides in ionic liquids, 1-butyl-3-methylimidazolium hexafluorophosphate and tetrafluoroborate. For the ambident ethyl acetoacetate anion, the reactions
Alkylation of malonic and acetoacetic esters in an ionic liquid
作者:Galina V. Kryshtal、Galina M. Zhdankina、Sergei G. Zlotin
DOI:10.1070/mc2002v012n02abeh001563
日期:2002.1
1-Butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF 6 ]) has been used as a recyclable medium in the alkylation of malonic and acetoaceticesters with alkyl, benzyl and prenyl halides.
Iron-Catalyzed Stereoselective Cross-Coupling Reactions of Stereodefined Enol Carbamates with Grignard Reagents
作者:Ana Cristina Parra Rivera、Raymond Still、Doug E. Frantz
DOI:10.1002/anie.201601899
日期:2016.6.1
A practical and highly stereoselective iron‐catalyzedcross‐coupling reaction of stereodefined enol carbamates and Grignard reagents to yield tri‐ and tetrasubstituted acrylates is reported. A facile method for the stereoselective generation of these enol carbamates has also been developed.
Marriage of Peroxides and Nitrogen Heterocycles: Selective Three-Component Assembly, Peroxide-Preserving Rearrangement, and Stereoelectronic Source of Unusual Stability of Bridged Azaozonides
作者:Ivan A. Yaremenko、Yulia Yu. Belyakova、Peter S. Radulov、Roman A. Novikov、Michael G. Medvedev、Nikolai V. Krivoshchapov、Alexander A. Korlyukov、Igor V. Alabugin、Alexander O. Terent’ev
DOI:10.1021/jacs.1c02249
日期:2021.5.5
Stable bridged azaozonides can be selectively assembled via a catalyst-free three-component condensation of 1,5-diketones, hydrogen peroxide, and an NH-group source such as aqueous ammonia or ammonium salts. This procedure is scalable and can produce gram quantities of bicyclic stereochemically rich heterocycles. The new azaozonides are thermally stable and can be stored at room temperature for several
通过 1,5-二酮、过氧化氢和氨水或铵盐等 NH 基团源的无催化剂三组分缩合反应,可以选择性地组装稳定的桥连氮杂化合物。该程序是可扩展的,可以产生克数量的双环立体化学丰富的杂环。新的氮杂化合物具有热稳定性,可在室温下储存数月而不分解,在 -10 °C 下可储存至少 1 年。对偶氮化合物的化学稳定性进行了探索,以用于随后的选择性转化,包括保留过氧化物基团的氨基过氧化物重排的第一个例子。氨基过氧化物中的氨基具有非常低的亲核性,不参与通常的胺烷基化和酰化反应。这些观察结果和 15 p与典型的二烷基胺相比,K a单位的碱性降低归因于强超共轭 n N →σ* C-O与两个反周面 C-O 键的相互作用。由于来自过氧化物氧的互补 n O →σ* C–N捐赠的弱点(“逆 α 效应”的结果),这种相互作用会消耗 NH 部分的电子密度,保护其免受氧化,并使其性质与酰胺相似。
Calcilytic Compounds
申请人:Ku Thomas Wen Fu
公开号:US20090137557A1
公开(公告)日:2009-05-28
Novel calcilytic compounds, pharmaceutical compositions, methods of synthesis and methods of using them are provided.