Facile synthesis of 1,2,3-tricarbonyls from 1,3-dicarbonyls mediated by cerium(IV) ammonium nitrate
作者:Akhil Sivan、Ani Deepthi
DOI:10.1016/j.tetlet.2014.01.145
日期:2014.3
A mild and efficient protocol for the synthesis of vicinal tricarbonyl compounds from β-dicarbonyls in a single step using cerium(IV) ammoniumnitrate as a catalytic oxidant is described. Ease of execution, wide substrate scope and the suitability for the synthesis of commercially important compounds like ninhydrin, alloxan and oxoline make this reaction particularly noteworthy.
Enantioselective Synthesis of Nitrogen–Nitrogen Biaryl Atropisomers via Copper-Catalyzed Friedel–Crafts Alkylation Reaction
作者:Xiao-Mei Wang、Peng Zhang、Qi Xu、Chang-Qiu Guo、De-Bing Zhang、Chuan-Jun Lu、Ren-Rong Liu
DOI:10.1021/jacs.1c07741
日期:2021.9.22
bioactive compounds. However, the atropisomerism arising from a restricted rotation around an N–N bond is largely overlooked. Here, we describe a method to access the first enantioselective synthesis of N–N biaryl atropisomers via a Cu-bisoxazoline-catalyzed Friedel–Crafts alkylation reaction. A wide range of axially chiral N–N bisazaheterocycle compounds were efficiently prepared in high yields with
The asymmetric synthesis of highly functionalized pyrrolidine derivatives with three contigious stereogenic centers and bearing a trifluoromethyl group has been developed through an organocatalytic domino Michael/Mannich [3+2] cycloaddition sequence. Employing...
A novel cycloisomerization reaction of enynes 4 in the
presence of ZnBr2 and THF (1 eq.) in
CH2Cl2 at −40 °C gave
exo-methylenic 1,3-dienes 5 in moderate to good yield.
The one-step synthesis of 2-hydroxy-2-(trifluoromethyl)malonates is described. The nucleophilic trifluoromethylation of commercially available 2-oxo-malonates was possible by use of the Ruppert-Pra...