Synthesis, Absolute Configuration and Biological Activity of Both Enantiomers of 2-(5,6-Dichloro-3-indolyl)propionic Acid: New Dichloroindole Auxins
作者:Masato KATAYAMA、Yasuhito KATO、Shingo MARUMO
DOI:10.1271/bbb.65.270
日期:2001.1
known. There was no essential difference between (S)-(+)- and (R)-(-)-5,6-Cl2-2-IPA in hypocotyl growth-inhibiting activity toward Chinese cabbage, but their inhibitory activities were stronger than that of the potent mother auxin, 5,6-Cl2-IAA. No essential difference in the coleoptile elongating activity of Avena sativa was apparent for the enantiomers, this activity being about one-third that of
外消旋的2-(5,6-二氯-3-吲哚基)丙酸(5,6-Cl2-2-IPA)由5,6-二氯吲哚-3-乙酸(5,6-Cl2-IAA)合成连续酯化,甲氧羰基化,甲基化和双重水解。外消旋体被转化为(S)-(-)-1-苯乙醇的非对映体酯。通过HPLC将它们分离成两个旋光非对映异构体,然后用对-TsOH水解为5,6-Cl2-2-IPA的旋光对映异构体。通过比较非对映异构体(S)-(-)-1-苯基乙基酯与非对映异构体(S)-(的对映体的1H-NMR光谱,确定了5,6-Cl2-2-IPA对映体的绝对构型已知其绝对构型的2-(3-吲哚基)丙酸(2-IPA)的-)-1-苯基乙酯。(S)-(+)-和(R)-(-)-5之间没有本质区别,6-Cl2-2-IPA对大白菜下胚轴生长具有抑制作用,但其抑制作用强于强效的植物生长素5,6-Cl2-IAA。对于对映异构体,没有明显的Avena sativa的胚芽鞘延长活性,该