作者:John J. Kilama、Bhashyam S. Iyengar、William A. Remers、Eugene A. Mash
DOI:10.1002/jhet.5570270547
日期:1990.7
Development of an efficient synthesis of the C-D ring portion of streptonigrin is a key operation in the synthesis of this antibiotic and its analogues. A new method for the synthesis of 3-cyano-5,6-dimethyl-4-(3,4,5-trimethoxyphenyl)-2-pyridone (14), a compound having the requisite functionality for conversion into a streptonigrin analogue, has been established. It involves treatment of 3,4,5-trimethoxybenzonitrile
链霉菌素的CD环部分的有效合成的开发是该抗生素及其类似物的合成中的关键操作。一种合成3-氰基-5,6-二甲基-4-(3,4,5-三甲氧基苯基)-2-吡啶酮的新方法(14),该化合物具有转化为链霉菌素类似物的必要功能,已建立。它涉及用乙基溴化镁和丙二腈处理3,4,5-三甲氧基苄腈,得到丙烯丙二腈衍生物7,将其与原乙酸三甲酯缩合,得到9和吡啶衍生物12的混合物。然后将12脱甲基得到14。该路线的总产率为50%,允许9至12的转化。