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A feasible procedure of using methyl formate as cheap reagent for the conversion of aliphatic and aromatic amines into formamides with high yields is reported. The improved amine formylation method proceeds mainly at room temperature and in presence of bicyclic guanidines as catalysts. A...
A series of novel unsaturated oximes were conveniently prepared from the corresponding vinylnitro compounds by reduction with SnCl 2 ·2H 2 O. The structures of the oximes were characterized by 1 H and 13 C NMR, IR and HRMS, and X-ray crystallography analysis of...
Conformational analyses of bicyclo( m . m . m )alkanes where m =1–10 and of bicyclo(8.8. n )alkanes where n =1–7 bearing methyl groups on the bridgeheads were carried out using a Monte Carlo search strategy. In the bicyclo( m . m . m )alkane series, greater variability was observed for the...
The introduction of a 1,3-diacetylpyridine moiety, as an additional binding niche in a macrocyclic receptor ligand containing a conjugated, push–pull malonate functionality, leads to, in addition to the 1:1 binding stoichiometry, the equilibrium formation of multiple complexes, specifically...
The stereoselective total synthesis of the marine alkaloid, (−)-amathaspiramide F ( 1 ), was achieved from the α-hydroxy-α-ethynylsilane 2 . The key steps involved in the synthesis were (1) the enolate Claisen rearrangement of the α-acyloxy-α-alkenylsilane for the stereoselective...
The effects of C–C bond conformation, double bond geometry, and relative stereochemistry on the kinetic and thermodynamic stability of 30 iminium cations as they undergo an aza-Cope rearrangement have been examined via density functional calculations for the purposes of predicting...
Reactions of electron-deficient alkenes with dibromomethylene compounds activated by cyano and ester groups were promoted by LiI or tetrabutylammonium bromide to afford the corresponding cyclopropanes in high yields.
The heterogeneous Amberlyst-15 catalyst displays efficient catalytic properties for the Friedel–Crafts reactions between an activated arenes or heteroarenes and α-amido sulfones. Various α-amido sulfones on treatment with 1,2,4-trimethoxy benzene give the Friedel–Crafts reaction products in...
A series of chiral trans -β-lactams was obtained via Staudinger cycloaddition with low to moderate diastereoselectivity (up to 54% de ) induced by a chiral amine component of the imine. It was shown that the direct connection of nitrogen to a chiral centre is crucial to induce chirality;...
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