Abstract
Six new 6-{N-[n-(N-alkoxy-N-alkylamino)alkyl]amino}purines were synthesized, and their cytokinin activity was tested by a rice leaf antisenescence bioassay and soybean hypocotyl bioassay. All six compounds were active in both bioassays. The most active compound in this study was 6-{N-[2-(N-methoxy-N-methylamino)ethyl]amino}purine (4a) which had the smallest side chain. In the rice leaf antisenescence bioassay, the activity of 4a was almost comparable to that of BA(6-benzylaminopurine) and somewhat higher than that of kinetin(6-furfurylaminopurine). However, in the soybean hypocotyl bioassay, 4a was about 10 times less active than BA. Unusually, 4a exhibited very high solubility in water.
