cis-Zeatin (3a) and its 9-(2-deoxy-β-D-ribofuranosyl) derivative (3c) have been synthesized from N-[(1, 1-dimethylethoxy)carbonyl]glycine methyl ester (5) in 5 steps by adopting the "α-amino aldehyde/olefination" technology. The new cis-zeatin derivative (3c), its trans isomer (1c), and known trans-zeatin 9-β-D-riboside (1b) were tested for cytokinin activity in the stimulation of chlorophyll biosynthesis in etiolated cucumber cotyledons. The riboside 1b turned out to be the most active cytokinin among them, while the deoxyribosides 1c and 3c showed a marked decrease and a total loss, respectively, of cytokinin activity.
采用 "α-
氨基醛/烯烃化 "技术,通过 5 个步骤从 N-[(
1,1-二甲基乙氧基)羰基]甘
氨酸甲酯(5)合成了顺式
玉米素(3a)及其 9-(2-脱氧-β-D-
呋喃核糖基)衍
生物(3c)。研究人员测试了新的顺式
玉米素衍
生物(3c)、其反式异构体(1c)和已知的反式
玉米素 9-β-D 核苷(1b)在刺激黄瓜子叶叶绿素
生物合成方面的
细胞分裂素活性。结果表明,核苷 1b 是其中活性最强的
细胞分裂素,而脱氧核苷 1c 和 3c 的
细胞分裂素活性分别明显下降和完全丧失。