Palladium-catalyzed carbocyclization–cross-coupling reactions of two different allenic moieties: synthesis of 3-(buta-1,3-dienyl) carbazoles and mechanistic insights
Palladium-catalyzed carbocyclization–cross-coupling reactions of two different allenic moieties: synthesis of 3-(buta-1,3-dienyl) carbazoles and mechanistic insights
Stereodefined rhodium-catalysed 1,4-H/D delivery for modular syntheses and deuterium integration
作者:Weiyi Wang、Yibo Yu、Bao Cheng、Huayi Fang、Xue Zhang、Hui Qian、Shengming Ma
DOI:10.1038/s41929-021-00643-9
日期:——
D delivery, deuterium atom(s) from differently deuterated allenols can be edited into the methyl or methylene groups of versatile organic skeletons, resulting in the efficient formation of 4-monodeuterated, 1,4- and 4,4-doubly deuterated, and 4,4,4-triply deuterated 2(E)-enals or -enones. These powerful platform molecules can provide straightforward paths to other deuteratedcompounds for different
掺入氘的化合物因其在制药工业、有机合成和材料科学中的重要性而备受关注。到目前为止,将氘整合到共价分子的惰性、饱和的神奇甲基或亚甲基中仍然具有挑战性。在这里,我们提出了烯丙基金属物质的 1,4-H 传递,为 3-甲基-2( E)-烯醛或-烯酮来自容易获得的 2,3-烯醇和有机硼酸。该反应包含许多合成通用的官能团以及多种药效团,并且不限于形成 3-甲基衍生物。通过应用 1,4-H 或 D 传递,来自不同氘化联烯醇的氘原子可以被编辑成多功能有机骨架的甲基或亚甲基,从而有效地形成 4-单氘化、1,4- 和 4 ,4-双氘代和 4,4,4-三重氘代 2( E )-烯醛或-烯酮。这些强大的平台分子可以为不同目的提供通往其他氘代化合物的直接途径。
General CuBr<sub>2</sub>-catalyzed highly enantioselective approach for optically active allenols from terminal alkynols
作者:Xin Huang、Tao Cao、Yulin Han、Xingguo Jiang、Weilong Lin、Jiasheng Zhang、Shengming Ma
DOI:10.1039/c5cc00697j
日期:——
A copper(ii) bromide-catalyzed highly enantioselective direct synthesis of 1,3-disubstituted allenols from commercially available aldehydes, terminal alkynols and (R)- or (S)-α,α-diphenylprolinol has been developed.
The first facile, efficient, atom-economical and regioselective palladium-catalyzed direct C–P cross-coupling of unprotected allenic alcohols with H-phosphonates for the one-pot synthesis of structurally diverse multisubstituted 2-phosphinoyl-1,3-butadienes was developed. This strategy would enrich the allene chemistry and afford new scaffolds to construct complex molecular skeletons.
We report the first directcatalyticasymmetric N1-functionalization of 1H-indoles via an allenylic alkylation strategy. This transformation produces N-alkylated indoles bearing axial chirality with a stereocenter non-adjacent (β) to the nitrogen. The regioselectivity (N1/C3) of this process can be switched efficiently. We also introduce a new class of tri-substituted allenylic electrophiles.
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。