stereoselective reduction reactions was used to synthesize new pyrrolidine-based iminosugars. The key step of this strategy involves the contruction of a highly functionalised pyrroldine ring skeleton through MCR approach. Subsequently, amination and reduction reactions to the ring skeleton provide a quick access to new pyrrolidine-basediminosugars. The iminosugars were then tested against alpha glucosidase
Synthesis of 2,3-Dioxo-5-(substituted)arylpyrroles and Their 2-Oxo-5-aryl-3-hydrazone Pyrrolidine Derivatives
作者:M. Mohammat、Z. Shaameri、A. Hamzah
DOI:10.3390/molecules14010250
日期:——
Some novel 2,3-dioxo-5-(substituted)-arylpyrroles have been synthesized. Among these, pyrrolidine compound 1b was converted to 2,3-dioxo-5-aryl pyrrolidine 2b. Finally a set of hydrazone derivatives was obtained from the reaction of 2b with various hydrazine salts. The structures of all the new synthesized compounds were confirmed by elemental analyses, IR and 1H-NMR spectra.
Diastereoselective reduction of 2,3-dioxo-4-carboxy-5-(substituted)pyrrolidine 1 by $NaBH_4/AcOH$ and heterogenous hydrogenation were reported. Stereochemical assignment and diastereomeric ratios of the products were determined using $^1H$ NMR and single crystal X-ray analyses. The steric factors of the C-5 substituents of the pyrrolidinone was shown to have an interesting influence on both the yield and diastereoselectivity of the reduced product.
Facile Reduction of β-Enamino Oxopyrrolidine Carboxylates
Mediated by Heterogeneous Palladium Catalyst
作者:F. N. A. Abdul Rashid、M. F. Mohammat、F. E. Bouchamma、Z. Shaameri、A. S. Hamzah
DOI:10.1134/s1070428020060184
日期:2020.6
The synthesis of diastereoisomers via diastereoselective hydrogenation of unreactive endocyclic enamine system of ethyl 4-hydrazinyl- and 4-(2-hydroxyethylamino)-5-oxo-2,5-dihydro-1H-pyrrole-3-carboxylates using palladium-based catalyst was developed. The steric and electronic properties of substituents, especially of the C(2)substituent, influenced both the yield and diastereoselectivity. Despite the reaction generated three chiral centers, the reduced compounds had eithercis-transor all-transconfiguration which was successfully determined by means of 1D and 2D NMR experiments.