L-acovenose

D-Oleandrose (38) has so far only been isolated from the digitanol glycoside lanafolein, but never from a cardenolide. With the exception of L-acofriose (27), L-acovenose (31), and L-diginose (42), all of these sugars have been prepared synthetically. A glycoside from Beaummtia grandiflora contains L-cymarose, which was recently obtained crystalline. 

All the 6-deoxyhexoses and all the methyl ethers found in these substances, except L-acofriose (27) and L-acovenose (31), have been synthesized. L-Acofriose (27) was first obtained by Hirst and Dunstan from... 

S.-C. Hung, S. R. Thopate, and R. Puranik, Synthesis of 6-deoxy-L-idose and L-acovenose from l,2 3,5-di-0-isopropylidene-a-D-glucofuranose, Carbohydr. Res., 331 (2001) 369-374. 

A number of 6-deoxyhexoses also are widespread in plants, but these compounds are especially common in cardiac glycosides (Courtois and Percheron, 1970). These sugars are formed from the corresponding hydroxylated monosaccharides (Luckner, 1990). Among the 6-deoxyhexoses are L-acofriose (6-deoxy-3-0-methyl-L-mannose) (18), l-acovenose (6-deoxy-3-6>-methyl-L-talose) (19), o-allometh-ylose (6-deoxy-D-allose) (20), L-altromethylose (6-deoxy-L-altrose) (21), D-antiarose (6-deoxy-o-gulose) (22), D-boivi-nose (2,6-dideoxy-D-xy/o-hexose) (17), D-cymarose (2,6-di-... 

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