Purines. LXII. Both Enantiomers of N6-(1,3-Dimethyl-2-butenyl)adenine and Their 9-.BETA.-D-Ribofuranosides: Synthesis and Cytokinin Activity.
作者:Tozo FUJII、Masashi OHBA、Hitoshi KAWAMURA、Yoshiyuki NAKASHIO、Kei HONDA、Satoshi MATSUBARA
DOI:10.1248/cpb.42.1045
日期:——
Both enantiomers [(1'R)-6 and (1'S)-6] of N6-(1, 3-dimethyl-2-butenyl)adenine and their 9-β-D-ribofuranosides [(1"R)-16 and (1"S)-16] have been synthesized for the first time from both enantiomers of alanine (15) in nine steps. These aglycones and nucleosides, together with N6-(3-methyl-2-butenyl)adenine (5) and its 9-β-D-ribofuranoside (18) as well as 9-β-D-ribofuranosyl-cis-zeatin (20) and 9-(2-deoxy-β-D-ribofuranosyl)-cis-zeatin (19), were tested for cytokinin activity in the tobacco callus bioassay. The order of their activity was 5>(1'R)-6>(1"R)-16≈18>(1'S)-6>(1"S)-16>20>19. The bioassay results are compared with those obtained previously for the derivatives modified analogously in the N6-substituent in the cis- and trans-zeatin series.
N6-(1, 3-二甲基-2-丁烯基)腺嘌呤的两种对映体 [(1'R)-6 和 (1'S)-6] 及其 9-β-D-呋喃核苷 [(1"R)-16 和(1"S)-16] 首次通过九个步骤从丙氨酸 (15) 的两种对映体合成。这些苷元和核苷,以及 N6-(3-甲基-2-丁烯基)腺嘌呤 (5) 及其 9-β-D-呋喃核苷 (18) 以及 9-β-D-呋喃核糖基-顺式-玉米素 (20) ) 和 9-(2-脱氧-β-D-呋喃核糖基)-顺式-玉米素 (19) 在烟草愈伤组织生物测定中测试了细胞分裂素活性。它们的活性顺序为5>(1'R)-6>(1”R)-16&18>(1'S)-6>(1”S)-16>20>19。将生物测定结果与先前获得的顺式和反式玉米素系列的N6-取代基中类似修饰的衍生物的生物测定结果进行比较。