使用 Me 3 SiX 类型的有机硅化合物(X = CN、N 3、C n F 2n+1和卤素)和胺碱,由相应的烷基氢过氧化物原位生成烷基甲硅烷基过氧化物。随后的原位铜催化均裂烷基过氧化硅得到烷基自由基,然后被亲核试剂 X (X = CN, N 3 , C n F 2n+1, 和卤素) 以提供具有新碳-碳、碳-氮或碳-卤素键的偶联产物,产率从好到高。此外,1-(三甲基甲硅烷基)吗啉还可用于原位生成过氧化烷基甲硅烷基,随后高效地用于酰胺的N-烷基化、芳基化和硼基化。
<sup>18</sup>F-Labeled 1,4-Dioxa-8-azaspiro[4.5]decane Derivative: Synthesis and Biological Evaluation of a σ<sub>1</sub> Receptor Radioligand with Low Lipophilicity as Potent Tumor Imaging Agent
We report the syntheses and evaluation of series of novel piperidine compounds with low lipophilicity as σ1 receptor ligands. 8-(4-(2-Fluoroethoxy)benzyl)-1,4-dioxa-8-azaspiro[4.5]decane (5a) possessed high affinity (Ki = 5.4 ± 0.4 nM) for σ1 receptors and selectivity for σ2 receptors (30-fold) and the vesicular acetylcholine transporter (1404-fold). [18F]5a was prepared using a one-pot, two-step labeling
Intramolecular Cyclization of Brominated Oxime Ether Promoted with Ytterbium(0) to the Synthesis of Cyclic Imines
作者:Yiqiong Wang、Fei Huang、Songlin Zhang
DOI:10.1002/ejoc.202000678
日期:2020.8.31
A general, efficient, and experimentally simple one‐pot new method for the synthesis of cyclic imines throughintramolecularcyclization of brominated oxime ether promoted by ytterbium(0) was reported for the first time. In this new strategy for the construction of cyclic imines, the N–O bond is used as a receptor of ytterbium reagent rather than as a source of N‐centred radical.
Visible light-promoted ring-opening functionalization of unstrained cycloalkanols<i>via</i>inert C–C bond scission
作者:Dongping Wang、Jincheng Mao、Chen Zhu
DOI:10.1039/c8sc01763h
日期:——
light-promoted ring-opening functionalization of unstrained cycloalkanols. Upon scission of an inert cyclic C–C σ-bond, a set of medium- and large-sizedrings are readily brominated under mild reaction conditions to afford the corresponding distal bromo-substituted alkyl ketones that are hard to synthesize otherwise. The products are versatile building blocks, which are easily converted to other valuable