Synthesis of heterocyclic compounds containing three contiguous hydrogen bonding sites in all possible arrangements
摘要:
The synthesis of compounds containing three contiguous hydrogen bond sites is reported. There are six ways of arranging three adjacent hydrogen bond donor (D) and acceptor (A) sites. General synthetic routes to heterocyclic compounds with each arrangement is reported.
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。
Pyridylmagnesium chlorides from bromo and dibromopyridines by brominemagnesium exchange: A convenient access to functionalized pyridines
corresponding pyridylmagnesium chlorides at room temperature by treatment with iPrMgCl. The resulting Grignard reagents were quenched by various electrophiles to afford functionalized pyridines. The brominemagnesium exchange of some dibromopyridines was also studied.
Synthesis of azafluorenone via oxidative intramolecular Heck cyclization
作者:Shubhendu Dhara、Atiur Ahmed、Sukla Nandi、Shantanu Baitalik、Jayanta K. Ray
DOI:10.1016/j.tetlet.2012.10.085
日期:2013.1
and highly efficient protocol to azafluorenone exploiting intramolecular oxidative Heckcyclization using Pd(0) is presented. Precursor alcohols afforded azafluorenone in a single step with simultaneous oxidation and cyclization under Heck reaction condition in excellent yield. This methodology could be very much crucial in the total synthesis of azafluorenone alkaloids for promising pharmacological