title: Three-hindered quadrant phosphine ligands with an aromatic ring backbone for the rhodium-catalyzed asymmetric hydrogenation of functionalized alkenes.
abstract: The three-hindered quadrant phosphine ligands (R)-1-tert-butylmethylphosphino-2-(di-tert-butylphosphino)benzene ((R)-3H-BenzP*) and (R)-2-tert-butylmethylphosphino-3-(di-tert-butylphosphino)quinoxaline ((R)-3H-QuinoxP*) exhibited good to excellent enantioselectivities in the rhodium-catalyzed asymmetric hydrogenation of selected dehydroamino acid derivatives, enamides, and ethenephosphonates.
authors.affiliation: Organic R&D Department, Nippon Chemical Industrial Co., Ltd., Kameido, Tokyo 136-8515, Japan.
authors.forename: Zhenfeng
authors.initials: Z
authors.lastname: Zhang
authors.forename: Ken
authors.initials: K
authors.lastname: Tamura
authors.forename: Daisuke
authors.initials: D
authors.lastname: Mayama
authors.forename: Masashi
authors.initials: M
authors.lastname: Sugiya
authors.forename: Tsuneo
authors.initials: T
authors.lastname: Imamoto