A Ni‐catalyzed [2+2+2] cycloaddition reaction between allene‐ynes and various mono‐, di‐ and tri‐substituted allenes is described. This protocol effectively differentiates allenyl π components and shows broad substrate generality to give highly functionalized carbocycles. A DFT study played a key role in revealing a detailed reaction mechanism that controls site‐, regio‐ and stereoselectivity, which
Orthoester compositions for affinity purification of oligonucleotides
申请人:Agilent Technologies, Inc.
公开号:US11299483B2
公开(公告)日:2022-04-12
Compounds and methods for purifying oligonucleotides such as RNA and DNA. A target oligonucleotide is reacted with an orthoester linker comprising an affinity tag to form an orthoester oligonucleotide-orthoester linker conjugate which is subjected to a purification technique to separate the target oligonucleotide from impurities such as truncated oligonucleotides. The orthoester linker can be then removed under mild conditions to generate the target oligonucleotide in high purity.
用于纯化 RNA 和 DNA 等寡核苷酸的化合物和方法。目标寡核苷酸与包含亲和性标签的正交酯连接体反应,形成正交酯寡核苷酸-正交酯连接体共轭物,该共轭物通过纯化技术从截短寡核苷酸等杂质中分离出目标寡核苷酸。然后在温和的条件下去除正交酯连接体,生成高纯度的目标寡核苷酸。
Ruthenium-Catalyzed Cyclocarbonylation of Allenyl Alcohols and Amines: Selective Synthesis of Lactones and Lactams
Allenyl alcohols such as 4-hydroxybuta-1,2-dienes and 5-hydroxypenta-1,2-dienes having a variety of substituents undergo cyclocarbonylation in the presence of a ruthenium catalyst under mild conditions selectively to give five- and six-membered lactones in a high yield with 100% atom economy. 5-Aminopenta-1,2-dines are also cyclocarbonylated to give gamma-lactams. A possible carbonylation mechanism involving a ruthenium cluster intermediate is proposed on the basis of experimental results.
Silva, Anthony N. De; Francis, Craig L.; Ward, A. David, Australian Journal of Chemistry, 1993, vol. 46, # 11, p. 1657 - 1672
作者:Silva, Anthony N. De、Francis, Craig L.、Ward, A. David
DOI:——
日期:——
Gelin,R. et al., Bulletin de la Societe Chimique de France, 1971, p. 4146 - 4152