A practical stereoselectivetotalsynthesis of (3R,5R)-5-hydroxy-de-O-methyllasiodiplodin has been accomplished viaPrinscyclization. It exhibits potato microtuber inducing activity. The synthetic sequence involves Prinscyclization, reductive opening of the pyran ring, esterification, and ring-closing metathesis (RCM) as the key steps. Prinscyclization - ring-closing metathesis - esterification