Stereoselective intramolecular nitrone cycloadditions to chiral allyl ethers

Unveiling the [3+2] cycloaddition between difluoromethyl diazomethane and 3-ylideneoxindole from the perspective of molecular electron density theory

Evolution of some key ELF basins along the IRC of the most favorable ortho/endo reaction path.

Progress towards the synthesis of aconitine: construction of the AE fragment and attempts to access the pentacyclic core

We reported the first successful preparation of fully functionalized aconitine AE fragment and attempts to access the pentacyclic skeleton of aconitine via radical cascade.

Synthesis of isoxazolidine-containing uridine derivatives as caprazamycin analogues

Simplification of caprazamycins was conducted by scaffold-hopping of the structurally complex diazepanone moiety to the isoxazolidine scaffold.

Antibacterial activity, quantitative structure-activity relationship and diastereoselective synthesis of isoxazolidine derivatives via 1,3-dipolar cycloaddition of d-glucose derived nitrone with olefin

The diastereoselectivity of the intermolecular 1,3-dipolar cycloaddition reaction of d-glucose-derived nitrones with both cyclic and acyclic dipolarophiles were studied. The reaction of nitrone with acyclic dipolarophiles resulted in the formation of the endo adduct exclusively whereas with cyclic dipolarophiles endo adduct was obtained as the major product. Antibacterial activity was evaluated for these eighteen isoxazolidine derivatives against Staphylococcus aureus NCIM5021, Escherichia coli NCIM 2931 and Pseudomonas aeruginosa NCIM 5029 by twofold dilution technique using resazurin as the indicator dye. Quantitative structureactivity relationships were developed with fourteen and the model was validated with four data. Electronic and spatial descriptors were the major contributors in all the three quantitative structureactivity relationship equations and the statistical parameters r(2), r(2)(adj) , F-ratio and q(2) were found to be satisfactory.

(3R*,4R*,5S*)-4-(4-Methyl-phen-yl)-2,3-diphenyl-7-[(R*)-1-phenyl-ethyl]-1-oxa-2,7-diaza-spiro-[4.5]decan-10-one oxime

In the title compound, C₃₄H₃₅N₃O₂, the polysubstituted piperidine ring adopts a chair conformation and the isoxazolidine ring is in an envelope form. The mol­ecules are linked into a chain along the b axis by O—H⋯N, C—H⋯O and C—H⋯N inter­actions. The chains are cross-linked via weak C—H⋯π inter­actions.