作者:Michael E. Jung、Joseph Pontillo
DOI:10.1021/jo016246j
日期:2002.9.1
is described. The beta-anomer of dideoxyribosyl nitriles 10a,b (prepared from glutamic acid) was converted into the methyl ketone 11. Addition of a silylated acetylide to 11 in diethyl ether/trimethylamine gave mainly 22a. Alkylation with methallyl halide and ozonolysis gave the ketone 24, which was then converted by hydrogenation and a second ozonolysis into the keto aldehyde 26. A two-step aldol process
描述了硬化菌素A的原始结构的类似物的途径。将双脱氧核糖基腈10a,b的β-端基异构体(由谷氨酸制备)转化为甲基酮11。在乙醚/三甲胺中将甲硅烷基化的乙炔化物加到11上,主要得到22a。用甲基烯丙基卤化物烷基化并进行臭氧分解,得到酮24,然后通过氢化和第二次臭氧分解将其转化为酮醛26。两步的醇醛缩醛工艺以良好的总产率提供了所需的3-吡喃酮27。然而,几种将该烯酮27转化为所需的菌藻素类似物2的方法失败了。