Practical Synthesis of the Trisubstituted Naphthalene Carboxylic Acid from Neocarzinostatin Chromophore
作者:Mark Rucker、Reinhard Brückner
DOI:10.1055/s-1997-983
日期:1997.10
Neocarzinostatin carboxylic acid (5) has been synthesized in 33% overall yield by a nine-step sequence which is operationally easy enough to be carried out by second-year chemistry students. 3,5-dimethylanisole was brominated in the para and in one benzylic position so that an SN2 reaction with sodium cyanide led to the cyanated aryl bromide 15. Heck-coupling with ethyl acrylate gave the α,β-unsaturated ester 14. It was converted into the saturated diester 18 through dissolving-metal reduction, saponification of nitrile and ester groups, and re-esterification with MeOH. Dieckmann cyclization and dehydroaromatization furnished ester 19 whose hydrolysis to the title compound 5 has been known.
新制癌菌素羧酸 (5) 通过九个步骤合成,总产率为 33%,操作简单,二年级化学学生即可完成。 3,5-二甲基苯甲醚在对位和一个苄基位置被溴化,以便与氰化钠发生 SN2 反应,生成氰化芳基溴 15。与丙烯酸乙酯进行 Heck 偶联,得到 α,β-不饱和酯 14。通过溶解金属还原、腈基和酯基的皂化、再酯化,转化为饱和二酯18甲醇。 Dieckmann环化和脱氢芳构化得到酯19,其水解成标题化合物5是已知的。