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The present work analyzes the anodic oxidation of the tetrabutylammonium salt of 1-benzoyl-2( S )- tert -butyl-6( S )-carboxyperhydropyrimidin-4-one, which is a useful starting material in the synthesis of enantiopure α-substituted β-amino acids. It was demonstrated that in CH 2 Cl 2 solvent,...
A range of fullerene–chalcone, fullerene–flavone, and fullerene–chromone dyads, including a bis(flavonyl)-fullerene dyad, were prepared by 1,3-dipolar cycloaddition reactions of azomethine ylides to C 60 and by cyclopropanation of C 60 with flavonyl malonates. Synthetic and natural...
Synthesis and characterization of several new anomerically pure galactose derivatives, based on simple and effective protective group manipulations of benzyl β - d -galactopyranoside, are reported. The monosaccharides described contain selectively protected/deprotected hydroxyl functionalities...
The use of (−)-sparteine as an external chiral ligand in enantioselective organolithium-induced alkylative double ring-opening of dihydropyrrole epoxides and 7-azanorbornene-type epoxides gives unsaturated acyclic amino alcohols, and amino cyclohexenols in up to 87% ee.
5,5′,6,6′-Tetrahydroxy-3,3′-biindolyl, the proposed structure of a phenolic antioxidant isolated from the red beetroot ( Beta vulgaris ), has been synthesised. The spectroscopic data of the synthetic material is not consistent with that reported for the natural product.
A new reaction of oxazolines derived from serine with diethyl phosphite leading to ring opening products with P–C bond formation is reported. This reaction, which proceeds under neutral conditions and without the use of any halogenated intermediate, results in a mixture of racemic α- and...
Paclitaxel analogues with a thiol group in place of the hydroxyl group on the C-13 side chain constitute an interesting avenue of research for the study of new taxoid compounds. A synthetic route for the preparation of the exact thiol surrogate product of Taxol ® by coupling (4 S , 5 S...
A rapid access to carbocyclic nucleosides containing a fused isoxazoline ring is proposed starting from cyclopentadiene. The route involves an hetero Diels–Alder cycloaddition reaction of nitrosocarbonylbenzene followed by a 1,3-dipolar cycloaddition of nitrile oxides, cleavage of the N–O...
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