De Novo Synthesis of the Bacterial 2-Amino-2,6-Dideoxy Sugar Building Blocks d-Fucosamine, d-Bacillosamine, and d-Xylo-6-deoxy-4-ketohexosamine
摘要:
The cell-surface glycans on bacteria contain many monosaccharides that cannot be obtained by isolation from natural sources. Availability of differentially protected monosaccharides is therefore often limiting access to potential oligosaccharide vaccine antigens. D-Fucosamine, D-bacillosamine, and D-xylo-2,6-deoxy-4-ketohexosamine building blocks were prepared via a divergent de novo synthesis from L-Garner aldehyde. The route relies on a chelation-control assisted organometallic addition and an anti-selective dihydroxylation reaction.
De Novo Synthesis of the Bacterial 2-Amino-2,6-Dideoxy Sugar Building Blocks d-Fucosamine, d-Bacillosamine, and d-Xylo-6-deoxy-4-ketohexosamine
摘要:
The cell-surface glycans on bacteria contain many monosaccharides that cannot be obtained by isolation from natural sources. Availability of differentially protected monosaccharides is therefore often limiting access to potential oligosaccharide vaccine antigens. D-Fucosamine, D-bacillosamine, and D-xylo-2,6-deoxy-4-ketohexosamine building blocks were prepared via a divergent de novo synthesis from L-Garner aldehyde. The route relies on a chelation-control assisted organometallic addition and an anti-selective dihydroxylation reaction.
Enantioselective Synthesis of Aminodiols by Sequential Rhodium‐Catalysed Oxyamination/Kinetic Resolution: Expanding the Substrate Scope of Amidine‐Based Catalysis
Regio‐ and stereoselective oxyamination of dienes through a tandem rhodium‐catalysed aziridination–nucleophilic opening affords racemic oxazolidinone derivatives, which undergo a kinetic resolution acylation process with amidine‐based catalysts (ABCs) to achieve s values of up to 117. This protocol was applied to the enantioselective synthesis of sphingosine.