title: One-pot cycloisomerization/hetero-Diels-Alder reaction of 1,6-enynes with aldehydes catalyzed by rhodium and a Brønsted acid.
abstract: A rhodium and Brønsted acid catalyzed one-pot cycloisomerization/hetero-Diels-Alder reaction of 1,6-enynes with unactivated aldehydes was established under mild conditions. This one-pot catalytic protocol produced a wide variety of annulated dihydropyrans from readily available starting materials in a highly atom economical manner.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan.
authors.forename: Mana
authors.initials: M
authors.lastname: Ishida
authors.forename: Ken
authors.initials: K
authors.lastname: Tanaka