Highly β-Regioselective Friedel-Crafts Aminoalkylation of Pyrroles with Cyclic Perfluoroalkylated Imines
作者:Olga I. Shmatova、Nikolay E. Shevchenko、Elisabeth S. Balenkova、Gerd-Volker Röschenthaler、Valentine G. Nenajdenko
DOI:10.1002/ejoc.201201725
日期:2013.5
A Friedel–Crafts-type alkylation reaction was studied between various pyrroles and α-polyfluoroalkylated cyclicimines that were activated by Lewis acids. The reaction proceeded under mild conditions and provided a high yielding synthesis of α-CF3-substituted pyrrolidines and piperidines as well as seven-membered analogues that contained a pyrrole ring. The unpredictably high β-selectivity for the
Cyclic imines bearing CF 3 and C 2 F 5 group were successfully used for the first Ugi multicomponent synthesis of polyfluoroalkyl-substituted proline, homoproline, and azepan carboxylic acid derivatives. Based on the suggested reaction the first synthesis of dipeptides containing α-CF 3 cyclic amino acids residue was described. The scope and limitations of the approach are discussed.
带有CF 3 和C 2 F 5 基团的环状亚胺已成功用于多氟烷基取代的脯氨酸、高脯氨酸和氮杂环庚烷羧酸衍生物的首次Ugi多组分合成。基于所建议的反应,描述了含有α-CF 3 环状氨基酸残基的二肽的第一次合成。讨论了该方法的范围和局限性。
New method of preparation of C2F5Li and its reactions with cyclic imines and lactims: Synthesis of α-pentafluoroethyl proline
作者:Nikolay E. Shevchenko、Valentine G. Nenajdenko、Gerd-Volker Röschenthaler
DOI:10.1016/j.jfluchem.2008.01.013
日期:2008.5
Addition of pentafluoroethyllithium to cyclic imines leads to pentafluoroethyl substituted pyrrolidines, piperidines and azepanes while reaction of cyclic lactims gives rise to 2-pentafluoroethyl imines. Oxidative cleavage of 2-furyl-2-pentafluoroethyl pyrrolidine has been found to be an effective method for the preparation of a racemic α-pentafluoroethyl proline.
Enantioselective Synthesis of Thiazole-Derived α-Perfluoroalkylated 5-7-Membered Amines
作者:Natalia G. Voznesenskaia、Olga I. Shmatova、Mikhail M. Ilyin、Mikhail M. Ilyin、Valentine G. Nenajdenko
DOI:10.1002/ejoc.201801845
日期:2019.3.7
Enantioselectivesynthesis of thiazole‐containing α‐perfluoroalkylated cyclic amines was elaborated. Enantioselective Strecker hydrocyanation followed by the reaction with hydrogen sulfide resulted in highly efficient formation of the corresponding thioamides. Finally, Hantzsch reactions provided access to a family of fluorinated analogues of natural products.
Pictet–Spengler Synthesis of Perfluoroalkylated Tetrahydro-γ-carbolines and Tetrahydropyrrolopyrazines
作者:Natalia G. Voznesenskaia、Olga I. Shmatova、Valentine G. Nenajdenko
DOI:10.1055/s-0039-1690729
日期:2020.1
A new method for the synthesis of perfluoroalkylated derivatives of γ-carboline and pyrrolopyrazine was elaborated. Pictet–Spengler reaction of isotryptamine and 2-(pyrrol-1-yl)ethanamine with trifluoromethylated carbonyls and 2-perfluoroalkyl-substituted five-, six-, and seven-membered cyclic imines was studied. It was found that this approach opens efficient access to a family of alkaloid-like compounds
阐述了合成γ-咔啉和吡咯并吡嗪全氟烷基化衍生物的新方法。研究了异色胺和2-(吡咯-1-基)乙胺与三氟甲基化羰基和2-全氟烷基取代的五元,六元和七元亚胺的Pictet-Spengler反应。已经发现,该方法打开了对结构中带有CF 3或C 2 F 5基团的生物碱样化合物家族的有效访问的途径。在与2-全氟烷基取代的环亚胺进行iso-Pictet-Spengler反应的情况下,制备了一系列带有氨基烷基的γ-咔啉。