Abstract
Several cyclic ADP-carbocyclic-ribose analogs 3–10 modified in the N-1-carbocyclic-ribose moiety were synthesized. Their Ca2+-releasing activity was estimated in sea urchin eggs to show that the 3″-deoxy analog 6 shows 5 times more potent activity than cADPcR, but the 2″,3″-didieoxy-2″,3″-unsunsaturated analog 3 has very weak activity. We also calculated their stable conformation and found that 3 and 6 were significantly different in their stable conformation.