A new stereoselective route to branched-chain nitro and amino sugars: synthesis of both enantiomers of decilonitrose and avidinosamine
摘要:
Short, efficient, and highly diastereoselective syntheses of the title carbohydrates (15, 21, and 22), components of new anthracycline antibiotics, on a gram scale from readily available keto sugar precursors 6 and 17 are described. The syntheses feature the smooth and clean addition of organocerium compounds to benzyloxyimino derivatives 7 and 18, which provide the branched-chain hydroxyamino sugars (9,20) bearing an equatorial methyl group with complete regio- and stereocontrol. Treatment of oximino deoxy sugars (7,18) with methyllithium resulted in beta-elimination and afforded pyranoid 1-enol 3-one oximes (8, 19).
A new stereoselective route to branched-chain nitro and amino sugars: synthesis of both enantiomers of decilonitrose and avidinosamine
摘要:
Short, efficient, and highly diastereoselective syntheses of the title carbohydrates (15, 21, and 22), components of new anthracycline antibiotics, on a gram scale from readily available keto sugar precursors 6 and 17 are described. The syntheses feature the smooth and clean addition of organocerium compounds to benzyloxyimino derivatives 7 and 18, which provide the branched-chain hydroxyamino sugars (9,20) bearing an equatorial methyl group with complete regio- and stereocontrol. Treatment of oximino deoxy sugars (7,18) with methyllithium resulted in beta-elimination and afforded pyranoid 1-enol 3-one oximes (8, 19).
Synthesis of d-rubranitrose by using a novel method for constructing functionalized branched-chain structures
作者:Ken-ichi Sato、Daisuke Miyama、Shoji Akai
DOI:10.1016/j.tetlet.2003.12.034
日期:2004.2
Convenient synthesis of d-rubranitrose from d-glucose was achieved by using simple and novel methods for deoxygenation and construction of functionalized branched-chain structures. The total yield of d-rubranitrose from methyl 4,6-O-benzylidene-α-d-glucopyranoside (1) was 4.9%.