58531-32-1Relevant academic research and scientific papers
An approach to the synthesis of 3-substituted piperidines bearing partially fluorinated alkyl groups
Subota, Andrii I.,Ryabukhin, Sergey V.,Gorlova, Alina O.,Grygorenko, Oleksandr O.,Volochnyuk, Dmitriy M.
, p. 61 - 66 (2019/05/29)
An approach to the 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 heterogeneous Pd-, Pt-, and Rh-based catalyst. It was found that in the case of fluoroalkyl derivatives, the pyridine core reduction was accompanied by hydrodefluorination, which became a limitation of the strategy. Nevertheless, the method worked well with 1,1-difluoroalkyl derivatives
A 2 - chloro - 5 - ethyl pyridine preparation method (by machine translation)
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Paragraph 0019; 0039; 0040, (2017/08/25)
The invention discloses a method for synthesizing 2 - chloro - 5 - ethyl pyridine method, by Suzuki reaction with 2 - chloro - 5 - bromo pyridine or by Wittig reaction with 2 - chloro - 5 - formyl pyridine is converted into 2 - chloro - 5 - vinyl pyridine; further uses the type (I) selective hydrogenation catalyst-containing structure, wherein R is cyclohexyl, butyl or phenyl, L is pyridine or unsaturated including nitrogen Cabeen, the 2 - chloro - 5 - vinyl pyridine is converted into 2 - chloro - 5 - ethyl pyridine. The method of the invention has a high selectivity, high yield and the advantage of convenient purification. (by machine translation)
