Enantioselective Synthesis of <i>N</i>-Cbz-Protected 6-Amino-6-deoxymannose, -talose, and -gulose
作者:Michael H. Haukaas、George A. O'Doherty
DOI:10.1021/ol016743m
日期:2001.11.1
The enantioselective synthesis of three 6-amino-6-deoxy sugars has been achieved in six to eight steps from furfural. A sequence of diastereoselective oxidation and reduction reactions produced Cbz-protected 6-aminomannose from furfuryl alcohol 3. The incorporation of a Mitsunobu reaction into the reaction sequence allows for the selective synthesis of both N-Cbz-protected 6-aminotalose and 6-aminogulose. The overall procedure allows for the synthesis of either enantiomer of these three aminosugars. [reaction: see text]
Enantioselective Synthesis of 2-Deoxy- and 2,3-Dideoxyhexoses
作者:Michael H. Haukaas、George A. O'Doherty
DOI:10.1021/ol025844x
日期:2002.5.1
[reaction: see text] The enantioselective syntheses of C-6 O-TBS- and N-Cbz-protected 2-deoxy- and 2,3-dideoxysugars have been achieved in 6-8 steps from furfural. A combination of chemo-, regio-, and diastereoselective oxidation and reduction reactions produced deoxysugars with various C-6 substitution. A key development of this route was the use of o-nitrobenzenesulfonylhydrazide (NBSH) as a diimide