通过在1-(2-(3-叠氮基丙基)吡啶-3-基)烷酮下环化5-取代的6,7,8,9-四氢-5 H-吡啶并[3,2- c ] a庚烷的方法描述了Staudinger-aza-Wittig反应条件。整个反应过程包括八个步骤,可以制备克量的标题产物。在某些情况下,观察到了5,7,8,9-四氢氧哌啶[4,3- b ]吡啶衍生物的形成。
通过在1-(2-(3-叠氮基丙基)吡啶-3-基)烷酮下环化5-取代的6,7,8,9-四氢-5 H-吡啶并[3,2- c ] a庚烷的方法描述了Staudinger-aza-Wittig反应条件。整个反应过程包括八个步骤,可以制备克量的标题产物。在某些情况下,观察到了5,7,8,9-四氢氧哌啶[4,3- b ]吡啶衍生物的形成。
Scalable Approach to Fluorinated Heterocycles with Sulfur Tetrafluoride (SF<sub>4</sub>)
作者:Serhii Trofymchuk、Maksym Bugera、Anton A. Klipkov、Volodymyr Ahunovych、Bohdan Razhyk、Sergey Semenov、Andrii Boretskyi、Karen Tarasenko、Pavel K. Mykhailiuk
DOI:10.1021/acs.joc.1c01518
日期:2021.9.3
A general approach to fluorinated (hetero)aromatic derivatives is elaborated. The key reaction is a deoxofluorination of substituted acetophenones with sulfur tetrafluoride (SF4). In contrast to previous deoxofluorination methods, this transformation is fast, scalable (up to 70 g), and high-yielding. More than 100 novel or previously hardly accessible fluorinated heterocycles, interesting for medicinal
An approach to the synthesis of 3-substituted piperidines bearing partially fluorinated alkyl groups
作者:Andrii I. Subota、Sergey V. Ryabukhin、Alina O. Gorlova、Oleksandr O. Grygorenko、Dmitriy M. Volochnyuk
DOI:10.1016/j.jfluchem.2019.05.006
日期:2019.8
synthesis of 3-substituted piperidines bearing partially fluorinated alkyl groups was proposed. The method was based on the DAST-mediated nucleophilic fluorination of easily available 2-bromopyridin-3-yl alcohols and ketones affording 2-bromo-3-(1-fluoroalkyl)pyridines and 2-bromo-3-(1,1-difluoroalkyl)pyridines, respectively, followed by catalytic hydrogenation. The hydrogenation step was studied with common
lenol, can be utilized for the synthesis of several important core structures. In this work, a method is developed for the diastereoselectivesynthesis of spirocyclic ethers using a silver catalyst under the presence of acid. This protocol can be applied to a variety of substrates resulting in the corresponding products in 35–97% yields with good diastereoselectivity. The proposed reaction mechanisms