Aerobic Oxidation of 3-Iodomethyl-<i>Δ</i><sup>3</sup>-cephem-4-carboxylate to 3-Formyl-<i>Δ</i><sup>3</sup>-cephem-4-carboxylate through 3-Hydroperoxymethyl-<i>Δ</i><sup>3</sup>-cephem-4-carboxylate
作者:Hideo Tanaka、Ryo Kikuchi、Sigeru Torii
DOI:10.1246/bcsj.69.229
日期:1996.1
Aerobic oxidation of p-methoxybenzyl 3-iodomethyl-8-oxo-7-phenylacetamido-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate (3-iodomethyl-7-phenylacetamido-Δ3-cephem-4-carboxylate) in N-methyl-2-pyrrolidone in the presence of phosphomolybdic acid mainly afforded the corresponding 3-formyl-Δ3-cephem-4-carboxylate, while similar aerobic oxidation in the presence of potassium iodide gave 3-hydroxymethyl-Δ3-cephem-4-carboxylate as a major product. 3-Hydroperoxymethyl-Δ3-cephem-4-carboxylate was isolated as a primary product in the aerobic oxidation, which was subsequently converted to either 3-formyl-Δ3-cephem-4-carboxylate by dehydration with phosphomolybdic acid or 3-hydroxymethyl-Δ3-cephem-4-carboxylate by reduction with potassium iodide.
3-iodomethyl-8-oxo-7-phenylacetamido-5-thia-1-azabicyclo[4.2.在磷钼酸存在下,N-甲基-2-吡咯烷酮中的 3-碘甲基-8-氧代-7-苯乙酰胺基-5-硫杂-1-氮杂双环[4.2.0]辛-2-烯-2-羧酸酯(3-碘甲基-7-苯乙酰胺基-Δ3-cephem-4-羧酸酯)主要得到相应的 3-甲酰基-Δ3-cephem-4-羧酸酯,而在碘化钾存在下的类似有氧氧化则得到 3-羟甲基-Δ3-cephem-4-羧酸酯作为主要产物。3-hydroperoxymethyl-Δ3-cephem-4-carboxylate 作为有氧氧化的主要产物被分离出来,随后通过磷钼酸脱水转化为 3-formyl-Δ3-cephem-4-carboxylate 或通过碘化钾还原转化为 3-hydroxymethyl-Δ3-cephem-4-carboxylate 。