Syntheses of cis-Zeatin and Its 9-(2-Deoxy-.BETA.-D-ribofuranosyl) Derivative. A Novel Synthetic Route to the Side Chain at C (6), and Cytokinin Activity.
作者:Antonio EVIDENTE、Gennaro PICCIALLI、Angelo SISTO、Masashi OHBA、Kei HONDA、Tozo FUJII
DOI:10.1248/cpb.40.1937
日期:——
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。