New methodology was developed for the introduction of an acetate unit into the Schiff base 2, based on the reaction of the Schiff base 2 with malonic acid monoester or vinyloxyborane. Furthermore, the synthesis of Boc-pyrimidoblamic acid, a key fragment for the total synthesis of bleomycin, was achieved by utilizing these two methods.
在希夫碱 2 与
丙二酸单酯或
乙烯氧基
硼烷反应的基础上,开发了将
醋酸单元引入希夫碱 2 的新方法。此外,还利用这两种方法合成了 Boc-
嘧啶基
氨基甲酸,它是全合成
博来霉素的关键片段。