Asymmetric totalsynthesis of ISP-I has been achieved by utilizing highly selective E-olefin formation based on the Schlosser-modified Wittig reaction and highly diastereoselective aldol reactions employing both chiral heterocyclic derivatives, 3-acetyl-(4S)-isopropyl-1,3-thiazolidine-2-thione and ethyl [(5R)-2,5-dihydro-5-isopropyl-3,6-diethoxypyrazin]-2-yl carboxylate.