Yuji Tokunaga, Maki Yagihashi, Masataka Ihara and Keiichiro Fukumoto
An intramolecular aldol reaction of keto acetals 1, regioselectively performed with Me3SiI–(Me3Si)2NH leading to spirobicyclic compounds 2 and 3, has been applied to the syntheses of (±)-spirojatamol and (±)-erythrodiene.