Purines. XLV. Syntheses and cytokinin activities of the cis isomers of (1'R)-1'-methylzeatin and its 9-.BETA.-D-ribofuranoside.
作者:Tozo FUJII、Masashi OHBA、Miwa SAKARI、Satoshi MATSUBARA
DOI:10.1248/cpb.38.2702
日期:——
(1'R)-1'-Methyl-cis-zeatin (2b) and its 9-β-D-ribofuranoside (4b) have been synthesized for the first time from D-alanine (5) in 7 steps. The new cis-zeatin derivatives 2b and 4b, together with known cis-zeatin (2a), were tested for cytokinin activity in the tobacco callus and the lettuce seed germination bioassays. In both bioassays, the cytokinin activity was found to follow the order 2a>2b>4b, indicating that 2b and 4b were less active than the corresponding trans isomers 1b and 3b (natural cytokinins from Pseudomonas syringae pv savastanoi), respectively.
(1'R)-1'-甲基-顺式玉米素 (2b) 及其 9-β-D-呋喃核苷 (4b) 首次由 D-丙氨酸 (5) 经 7 个步骤合成。新的顺式玉米素衍生物 2b 和 4b 以及已知的顺式玉米素 (2a) 在烟草愈伤组织和生菜种子发芽生物测定中进行了细胞分裂素活性测试。在这两种生物测定中,发现细胞分裂素活性遵循 2a>2b>4b 的顺序,表明 2b 和 4b 的活性分别低于相应的反式异构体 1b 和 3b(来自丁香假单胞菌 pv savastanoi 的天然细胞分裂素)。