Scheme 9.
Synthesis of the S. sonnei zwitterionic di‐ to octasaccharides 1–4. (i) Pd(OH)2/C, H2, tBuOH/DCM/H2O, (ii) NH2OH, MeOH, 57 % for 1, 39 % for 2, 31 % for 3, and 16 % for 4 over two steps.
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