Purines. LV. Syntheses and Cytokinin Activities of Some Adenine and Adenosine Derivatives Related to 1'-Methylzeatin.
作者:Tozo FUJII、Masashi OHBA、Hitoshi KAWAMURA、Tsuyoshi HANEISHI、Satoshi MATSUBARA
DOI:10.1248/cpb.41.1362
日期:——
(1'S)-1-Methyl-cis-zeatin [(1'S)-2] and its 9-β-D-ribofuranoside [(1"S)-4] were synthesized from L-alanine through [S-(Z)]-4-amino-2-methyl-2-penten-1-ol ethanedioate [(S)-3]. Condensations of 2-hydroxy-6-methylthiopurine (16) with the trans-isomeric amine salt [(S)-15], its enantiomer [(R)-15], and the racemic modification [(±)-15] furnished (1'S)-, (1'R)-, and (±)-2-hydroxy-1'-methyl-trans-zeatine (6), respectively. A similar condensation of 16 with methylamine yielded 2-hydroxy-N6-methyladenine (7). These adenine derivatives were tested for cytokinin activity in the tobacco callus bioassay, and the order of their activity was (1'R)-6>(±)-6>(1'S)-2>7; on the other hand, (1"S)-4 and (1'S)-6 were completely inactive at 0.1-100μM and 0.01-10μM concentrations, respectively. As a result of the above syntheses of (1'R)-6, (1'S)-6, (±)-6, and 7, the gross structures of a marine green alga cytokinin and of a blue coral cytokinin were established to be 6 and 7, respectively.
以L-丙氨酸为原料,通过[S-(Z)]合成(1'S)-1-甲基-顺式玉米素[(1'S)-2]及其9-β-D-呋喃核苷[(1"S)-4] -4-氨基-2-甲基-2-戊烯-1-醇乙二酸酯[(S)-3] 2-羟基-6-甲基硫嘌呤(16)与反式异构胺盐[(S)-15]、其对映体[(R)-15]和外消旋体[(±)-15]提供(1'S)-、(1'R)-和(± )-2-羟基-1'-甲基-反式-玉米丁(6),分别用甲胺进行类似的缩合,得到2-羟基-N6-甲基腺嘌呤(7)。烟草愈伤组织生物测定中的细胞分裂素活性,其活性顺序为(1'R)-6>(±)-6>(1'S)-2>7;另一方面,(1"S)-4和(1'S)-6 分别在 0.1-100μM 和 0.01-10μM 浓度下完全失活。作为(1'R)-6、(1'S)-6、(±)-6和7的上述合成的结果,海洋绿藻细胞分裂素和蓝珊瑚细胞分裂素的总体结构被确定为分别为6和7。