- A concise synthesis of 4-nitrophenyl 2-azido-2-deoxy- and 2-acetamido-2-deoxy-d-mannopyranosides
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4-Nitrophenyl 3,4,6-tri-O-acetyl-2-azido-2-deoxy-α- and β-d-mannopyranosides were prepared from methyl 4,6-O-benzylidene-α-d- glucopyranoside and 1,3,4,6-tetra-O-acetyl-α-d-glucopyranose, respectively. Chemoselective reduction of both azides with hydrogen sulfide readily afforded 4-nitrophenyl 2-acetamido-4,6-di-O-acetyl-2-deoxy-α-d- and -β-d-mannopyranosides in higher yields than reduction with triphenylphosphine or a polymer-supported triarylphosphine. Subsequent de-O-acetylation yielded 4-nitrophenyl 2-acetamido-2-deoxy-α-d- mannopyranoside and 4-nitrophenyl 2-acetamido-2-deoxy-β-d-mannopyranoside in 20% and 44% overall yields, respectively.
- Popelová, Alena,Kefurt, Karel,Hlavá?ková, Martina,Moravcová, Jitka
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p. 161 - 166
(2007/10/03)
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- Synthesis of 4-nitrophenyl 2-acetamido-2-deoxy-β-D-mannopyranoside and 4-nitrophenyl 2-acetamido-2-deoxy-α-D-mannopyranoside
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The title compounds were synthesized by the selective reduction of the azido group in 4-nitrophenyl 3,4,6-tri-O-acetyl-2-azido-2-deoxy-α-D-mannopyranoside (8) and 4-nitrophenyl 3,4,6-tri-O-acetyl-2-azido-2-deoxy-β-D-mannopyranoside (11), and by subsequent acetylation. Compound 8 was prepared by opening of the epoxide ring in methyl 2,3-anhydro-4,6-O-benzylidene-α-D-glucopyranoside (1) with sodium azide, followed by inversion of the configuration at C-3 in the resulting altropyranoside and glycosidation with 4-nitrophenol.
- Krist, Pavel,Kuzma, Marek,Pelyvas, Istvan F.,Simerska, Pavla,Kren, Vladimir
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p. 801 - 811
(2007/10/03)
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