An efficient didehydroxylation method for the biomass-derived polyols glycerol and erythritol. Mechanistic studies of a formic acid-mediated deoxygenation
作者:Elena Arceo、Peter Marsden、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1039/b907746d
日期:——
An efficient 1,2-deoxygenation method, involving an unexpected mechanism, was found for simple diols and for biomass-derived polyols (glycerol and erythritol) that results in the conversion of the 1,2-dihydroxy group to a carbon–carbon double bond.
[EN] CYCLIC DI-NUCLEOTIDES COMPOUNDS FOR THE TREATMENT OF CANCER<br/>[FR] COMPOSÉS DINUCLÉOTIDIQUES CYCLIQUES POUR LE TRAITEMENT DU CANCER
申请人:EISAI R&D MAN CO LTD
公开号:WO2018152450A1
公开(公告)日:2018-08-23
Provided herein are compounds useful for the treatment of cancer.
本文提供了用于癌症治疗的化合物。
Total Synthesis of (±)-Jiadifenin and Studies Directed to Understanding Its SAR: Probing Mechanistic and Stereochemical Issues in Palladium-Mediated Allylation of Enolate-Like Structures
作者:David A. Carcache、Young Shin Cho、Zihao Hua、Yuan Tian、Yue-Ming Li、Samuel J. Danishefsky
DOI:10.1021/ja056980a
日期:2006.1.1
carbonate, we could probe, for the first time, the stereochemical relationship between the inter- and intramolecular versions of this process. The existence of concurrent inter- and intramolecular allylation reactions was demonstrated by deuteration experiments. While in the particular case at hand, we find very little difference in stereochemical outcome as one partitions between the inter- and intramolecular
加地芬宁的全合成已完成。该合成使我们能够建立一个 SAR 谱,这表明从指定潜在药物的角度来看,加地芬宁骨架可能不如其重排前体的骨架更理想。加地芬宁问题的关键步骤涉及构建两个与 1,3 相关的季碳。该论文描述了在这种情况下如何管理立体化学。该问题在当时由钯介导的碳酸烯丙酯转移过程引起的新烯丙基转移反应的水平上进行了相当详细的研究。通过使用外部氘代碳酸二烯丙酯,我们可以首次探索该过程的分子间和分子内形式之间的立体化学关系。氘化实验证明了同时存在的分子间和分子内烯丙基化反应。虽然在手头的特殊情况下,我们发现立体化学结果的差异很小,因为分子间和分子内途径之间的一个分区,所采用的技术适用于其他系统。
VMAT2 imaging agent, D6-[18F]FP-(+)-DTBZ: Improved radiosynthesis, purification by solid-phase extraction and characterization
作者:Ruiyue Zhao、Zhihao Zha、Xinyue Yao、Karl Ploessl、Seok Rye Choi、Futao Liu、Lin Zhu、Hank F. Kung
DOI:10.1016/j.nucmedbio.2019.07.002
日期:2019.5
([18F]9), targeting vesicular monoamine transporter 2 (VMAT2) in the central nervous system, was reported as a useful imaging agent for the diagnosis of Parkinson's disease (PD). The production of [18F]9 was optimized and simplified by using solid-phase extraction (SPE) purification. METHODS Three major nonradioactive impurities were synthesized and characterized. The preparation of [18F]9 was optimized
Use of the Perdeuteroallyl Protecting Group Facile and straightforward transformations of propynoic acid into perdeuterated allyl bromide are described. The advantage of the pentadeuteroallyl protection for the 1H-N.M.R. structure elucidation of complex carbohydrate derivatives is demonstrated in the 2,6-dideoxy-L-ribo-series.