Intramolecular Nitrone Cycloaddition Reaction on Carbohydrate-Based Precursors: Application in the Synthesis of Spironucleosides and Spirobisnucleosides
作者:Kaushik Singha、Atanu Roy、Pradeep K. Dutta、Subhankar Tripathi、Sk. Sahabuddin、Basudeb Achari、Sukhendu B. Mandal
DOI:10.1021/jo035813v
日期:2004.9.1
A simple synthesis of chiral spironucleosides and spirobisnucleosides is described. Intramolecular 1,3-dipolar nitronecycloadditionreaction of d-glucose-derived precursors having olefin at C-3 and nitrone at C-5, C-1, or C-2 (in nor-series) furnished bisisoxazolidinospirocycles 4−7, 11, and 12 in good yields. Reductive ring opening of the isoxazolidine moieties in 4−6 followed by construction of