(2R*,4S*,6S*,αS*)- and (2R,4R,6R,αS)-Streptovitacin-C2 (STV-C2) (1a and 1b) were synthesized by an aldol condensation of (2R*,4S*)- or (2R,4R)-2,4-dimethyl-2-trimethylsiloxy-1-cyclohexanone (15a or 15b) with 4-(2-oxoethyl)-2,6-piperidinedione (16), which was followed by desilylation of the products. The stereochemistry of the synthesized STV-C2 isomers (1a and 1b) was elucidated by NMR. STV-C2 isomers (1a and 1b) did not show strong antimicrobial activity against Saccharomyces cerevisiae and Pyricularia oryzae.
(2R*,4S*,6S*,αS*)- 和 (2R,4R,6R,αS)-STreptovitacin-C2 (STV-C2) (1a 和 1b) 是通过 (2R*,4S*)- 或 (2R,4R)-2、4-(2-氧代乙基)-2,6-
哌啶二酮 (16) 与 (2R*,4S*)-或 (2R,4R)-2,
4-二甲基-2-三甲基
硅氧基-1-
环己酮 (15a 或 15b) 进行醛醇缩合,然后对产物进行脱
硅处理。合成的 STV-C2 异构体(1a 和 1b)的立体
化学结构通过核磁共振得以阐明。STV-C2 异构体(1a 和 1b)对酿酒酵母(Saccharomyces cerevisiae)和圆疫霉(Pyricularia oryzae)没有显示出很强的抗菌活性。