Hexofuranurono-6,3-lactone

A. P. Rauter and H. Weidmann, Versuche zur Verzweigung von Hexofuranur-ono-6,3-lactonen Synthese von 5-Desoxy-l,2-0-isopropyliden-5-C-methylen-x-D-xyZo-hexofuranurono-6,3-lacton, Liebigs Ann. Chem. (1982) 2231-2237. 

Reactions of Derivatives of Hexofuranurono-6,3-lactones with Sodium Borohydride in Hexamethylphosphoric Triamide Yielding Derivatives of Hex-2-enono-l,4-lactones57... 

Derivatives of 5-deoxy-D-xi/fo-hexofuranurono-6,3-lactone may be obtained by starting from l,2-0-alkylidene-5-0-(methylsulfonyl)-a-D-glucofuranurono-6,3-lactones by two different procedures. 

Rauter and coworkers demonstrated that C-5-aIkylidene derivatives 112 of D-hexofuranurono-6,3-lactone can be obtained by Wittig olefination of the a-ketolactone 111 (Scheme 32) [160]. The related a-methylene lactone 114 was prepared in three steps from 3,6-anhydro-l,2-0-isopropylidene-a-D-j y/ )-5-hexulo-furanose 113 via Wittig reaction and aUylic oxidation. 

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