title: Unusual regioselective intramolecular Diels-Alder reaction forming tricyclo[4.3.1.0(3,7)]decane system.
abstract: The intramoleculae Diels-Alder reaction of cyclohexenone having an unsaturated ester side chain afforded tricyclo[4.3.1.0(3,7)]decanone in both a regio- and stereoselective manner under TMSCl-NEt(3)-ZnBr(2) conditions. Unexpectedly, the regiochemical control was against the conventional orbital requirement.
authors.affiliation: Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, Aobayama, Sendai 980-8578, Japan.
authors.forename: Kiyosei
authors.initials: K
authors.lastname: Takasu
authors.forename: Sayaka
authors.initials: S
authors.lastname: Mizutani
authors.forename: Masataka
authors.initials: M
authors.lastname: Ihara