The invention relates to a novel process for the preparation of 3-hydroxy penam-1-oxides and esterified and etherified derivatives thereof. The process involves reaction of a penam-1-oxide mixed anhydride with a peracid followed by rearrangement and decarboxylation of the product initially formed to yield a 3-aroyloxy-penam-1-oxide. The latter compound may if desired subsequently be subjected to reductive cleavage to yield a 3-hydroxy compound, such reductive cleavage conveniently being effected by means of zinc and an ammonium salt under neutral or acidic conditions. The compounds prepared by the process of this invention are useful as intermediates in the preparation of antibiotics.
本发明涉及一种制备3-羟基青霉烯-1-氧化物及其酯化和乙酰化衍
生物的新工艺。该工艺涉及将青霉烯-1-氧化物混合酸酐与过氧酸反应,随后对最初形成的产物进行重排和脱羧,以产生3-芳酰氧基-青霉烯-1-氧化物。如果需要,后者可以随后经过还原裂解,以产生3-羟基化合物,这种还原裂解可以方便地通过
锌和
铵盐在中性或酸性条件下进行。本发明所制备的化合物可用作抗生素制备中间体。