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(2R, 3S, 4S)-3, 4-Dihydroxy-2-hydroxymethylpyrrolidin (6) and polyoxamic acid (20) were synthesized from (S)-pyroglutamic acid derivatives (1 and 7). The key reactions are the selective mono-O-benzylation of 1 and 7, and subsequent Mitsunobu reaction to invert the stereochemistry of the free hydroxy group of 3 and 11.
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Nobuo Ikota (1989) studied this question.
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