title: A Concise Route to (+)-Estrone.
abstract: A concise route to the Torgov diene, the key intermediate of estrone, has been devised using a chiral dioxycyclopentenone as the starting material by employing a sequence of five steps of reactions involving a Lewis acid-mediated Diels-Alder reaction with Dane's diene.
authors.affiliation: Pharmaceutical Institute, Tohoku University, Aobayama, Sendai 980-8578, Japan.
authors.initials: K
authors.lastname: Tanaka
authors.initials: H
authors.lastname: Nakashima
authors.initials: T
authors.lastname: Taniguchi
authors.initials: K
authors.lastname: Ogasawara