Stereoselective Construction of 2,8-Dioxabicyclo[3.3.1]nonane/nonene Systems from 3-C-Branched Glycals

[1,2]- vs [2,3]-Wittig Rearrangement in Carbohydrate Derived Alkenyl Systems

A simple and efficient strategy for the regio- and stereoselective synthesis of carbon-branched sugar derivatives is described. The successful implementation of Wittig rearrangement on substrates derived by Ferrier rearrangement of various glycals and 3-O-alkenyl glycals is studied extensively. A highly selective [1,2]- or [2,3]-Wittig rearrangement is revealed that provides a novel class of stereodefined 3-C-branched glycals and C-glycosides, which are otherwise difficult to obtain.

Coumarin heterocyclic derivatives: chemical synthesis and biological activity

This review highlights the broad range of science that has arisen from the synthesis of coumarin-linked and fused heterocycle derivatives. Specific topics include their synthesis and biological activity.

Catalyst-free one-pot domino reactions for selective synthesis of functionalized 2,8-oxazabicyclo[3.3.1]-nonanes and 5H-indeno[1,2-b]pyridin-5-ones

A simple and efficient method for one-pot selective synthesis of functionalized 2,8-oxazaxabicyclo[3.3.1]nonanes and hydroxy-containing 5H-indeno[1,2-b]pyridin-5-ones under catalyst-free conditions has been developed.

The first stereoselective total synthesis of neosemburin and isoneosemburin

The stereoselective total synthesis of neosemburin and isoneosemburin was achieved using 3-C-branched sugar precursors which in turn were synthesized by Claisen rearrangement of sugar derived allyl vinyl ethers.

A convenient and efficient synthesis of glycals by zinc nanoparticles

A simple and efficient method for the synthesis of pyranoid glycals utilizing the reductive elimination of glycopyranosyl bromides by zinc nanoparticles in an acetate buffer is described. A variety of pyranoid glycal derivatives were obtained, especially for the synthesis of 6-deoxy-4,6-O-benzylidene and disaccharide glycals with good yields.