5′-Spiro-cyclopropanated lactose derivatives as suitable intermediates for the chain elongation: synthesis of a new 6-deoxy-6-methyl δ-eptulose

- New route for the synthesis of δ-dicarbonyl heptose.
- Hex-5′-enopyranoside cyclopropanation by ethoxycarbonyl carbene addition.
- The experimental results have been rationalized with computational calculations.
- Semiempirical PM6-D3 Hamiltonian achieve results where DFT calculations fails.