Approach to 3-(Cyclo)alkylpiperidines through ‘sp3–sp3 via sp2–sp3’ Coupling
摘要:
The idea of introducing (cyclo)alkyl substituents at the C-3 atom of the piperidine ring, that is, formal sp(3)-sp(3) retrosynthetic disconnection, is implemented through a two-step reaction sequence including directed ortho metalation of a pyridine derivative and the subsequent quenching with a carbonyl compound, followed by catalytic hydrogenation. This robust but very efficient method allows for multigram preparation of sp(3)-rich 3-(cyclo)alkylpiperidines, which are valuable building blocks for medicinal chemistry and other areas.
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
Approach to 5-substituted 6,7,8,9-tetrahydro-5 H -pyrido[3,2- c ]azepines
作者:Andrii I. Subota、Oleksiy S. Artamonov、Alina Gorlova、Dmitriy M. Volochnyuk、Oleksandr O. Grygorenko
DOI:10.1016/j.tetlet.2017.04.030
日期:2017.5
An approach to 5-substituted 6,7,8,9-tetrahydro-5H-pyrido[3,2-c]azepines via the cyclization of 1-(2-(3-azidopropyl)pyridin-3-yl)alkanones under Staudinger–aza-Wittig reaction conditions is described. The overall reaction sequence includes eight steps and allows for the preparation of gram quantities of the title products. In some cases, the formation of 5,7,8,9-tetrahydrooxepino[4,3-b]pyridine derivatives
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。
Romero; Morge; Biles, Journal of Medicinal Chemistry, 1994, vol. 37, # 7, p. 999 - 1014