Baker's yeast reduction of N-tert-butoxycarbonyl (Boc) or N-benzyloxycarbonyl(Cbz) protected methyl 4-amino-3-oxopentanoates 4b-e and 4-amino-3-oxobutanoates 7a,b stereoselectively afforded the erythro-hydroxy esters 5b-e and (R)-hydroxy esters 8a, b, respectively. The resulting N-protected methyl (R) -4-amino-3-hydroxybutanoate (8) was converted into the biologically active substances, sperabillin C 1c and (R)-GABOB [(R)4-amino-3-hydroxybutanoic acid. 2].
面包酵母还原 N-叔丁氧基羰基 (Boc) 或 N-苄氧基羰基 (Cbz) 保护的 4-
氨基-
3-氧代戊酸甲酯 4b-e 和
4-氨基-3-氧代丁酸 7a,b 立体选择性地得到赤羟基酯 5b -e和(R)-羟基酯分别为8a、b。所得N-保护的(R)-
4-氨基-3-羟基丁酸甲酯(8)被转化为
生物活性物质sperabillin C 1c 和(R)-GABOB [(R)
4-氨基-3-羟基丁酸。 2]。