[3+2] Anionic Cycloaddition of Isocyanides to Acyclic Enamines and Enaminones: A New, Simple, and Convenient Method for the Synthesis of 2,4-Disubstituted Pyrroles
作者:Ilya V. Efimov、Maria D. Matveeva、Rafael Luque、Vasiliy A. Bakulev、Leonid G. Voskressensky
DOI:10.1002/ejoc.201901776
日期:2020.3.8
Herein, a new route toward 2,4‐substituted pyrroles is presented. This is a new, simple, fast, and convenientmethod furnishing 2,4‐substituted pyrroles based on the formal cycloaddition reaction of isocyanides with acyclic enamines or enaminones under basic conditions.
The first synthesis of 2,3-diaroyl quinolines via a formal [3 + 2 + 1] cycloaddition of enaminones, aryl methyl ketones, and aryl amines is disclosed. This reaction efficiently affords a 1,4-dicarbonyl scaffold, which is a useful building block for constructing complex fused heterocycles. Furthermore, the 1,4-dicarbonyl scaffold has been used directly to prepare pyridazino[4,5-b]quinoline skeletons
公开了通过烯胺酮,芳基甲基酮和芳基胺的正式[3 + 2 + 1]环加成的2,3-二酰基酰基喹啉的首次合成。该反应有效地提供了1,4-二羰基支架,这是用于构建复杂的稠合杂环的有用的构建基。此外,已将1,4-二羰基支架直接用于一锅制备哒嗪并[4,5- b ]喹啉骨架。
The use of enaminones and enamines as effective synthons for MSA-catalyzed regioselective synthesis of 1,3,4-tri- and 1,3,4,5-tetrasubstituted pyrazoles
In the present work, an efficient regioselectivesynthesis of 1,3,4-tri- and 1,3,4,5-tetrasubstituted pyrazoles via a methanesulfonic acid (MSA)-catalyzed reaction of hydrazones with enaminones or enamines is reported. Mechanistically, the formation of the title compounds involves the [2+3] cycloaddition of hydrazones with enaminones or enamines followed by aromatization with acid and oxygen. This
Harnessing Stereospecific <i>Z</i>-Enamides through Silver-Free Cp*Rh(III) Catalysis by Using Isoxazoles as Masked Electrophiles
作者:Suvankar Debbarma、Sourav Sekhar Bera、Modhu Sudan Maji
DOI:10.1021/acs.orglett.8b04130
日期:2019.2.1
The stereospecificsynthesis of Z-enamides is described in this paper. For the first time, isoxazoles have been employed as electrophiles in C–H functionalization to afford thermodynamically less stable Z-enamides utilizing salicylaldehydes in an atom- and step-economic fashion. The stereochemistry of enamides might originate from the relative disposition of atoms present in isoxazole and the intramolecular
New 1-(2-chloroquinolin-3-yl)-4-dimethylamino-2-(naphthalen-1-yl)-1-phenylbutan-2-ols with antituberculosis activity
作者:A. V. Omel’kov、V. E. Fedorov、A. A. Stepanov
DOI:10.1007/s11172-019-2646-5
日期:2019.10
New 4-dimethylamino-2-(naphthalen-1-yl)-1-phenyl-1-(quinolin-3-yl)butan-2-ols with antituberculosis activity were synthesized. (1R*,2S*)-1-(6-Bromo-2-chloroquinolin-3-yl)-4-dimethylamino-2-(naphthalen-1-yl)-1-phenylbutan-2-ol hydrocitrate exhibiting high antituberculosis activity is in the final stage of clinical trials and is prepared for use in clinical practice.