Baer HH, Radatus B. Two syntheses of 3-amino-3-deoxy-alpha-D-altropyranosyl 3-amino-3-deoxy-alpha-D-altropyranoside, a new analog of alpha,alpha-trehalose, involving reduction of a diazide and reductive amination of a diketone.
Carbohydr Res 1986;
157:65-81. [PMID:
3815417 DOI:
10.1016/0008-6215(86)85060-1]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A new diamino sugar, 3-amino-3-deoxy-alpha-D-altropyranosyl 3-amino-3-deoxy-alpha-D-altropyranoside (5) was synthesized by two routes starting from alpha,alpha-trehalose. The first route involved reduction and deprotection of a previously described, benzylidenated diazido analog. The second approach proceeded from the known 2,2'-di-O-benzyl-4,6;4',6'-bis-O-benzylidene derivative of alpha-D-altropyranosyl alpha-D-altropyranoside, to the corresponding 3,3'-diketone, which was subjected to reductive amination with sodium cyanoborohydride and ammonium acetate. The major product, separated in 39% yield from by-products after N-acetylation, was deprotected to give 5. Four by-products were isolated in low yields and determined to be monoaminated analogs which comprise two epimeric, 3'-hydroxy structures and two 3'-epimeric, 3'-cyano-3'-hydroxy structures in their non-aminated residues. A number of observations concerning the 13C- and 1H-n.m.r. spectra of the products are discussed, especially with regard to chemical-shift dependencies for certain ring and substituent protons, and attention is drawn to some inter-residue shielding phenomena.
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