title: Organocatalyzed asymmetric Michael reaction of β-aryl-α-ketophosphonates and nitroalkenes.
abstract: The first enantioselective Michael reaction of β-aryl-α-ketophosphonates and nitroalkenes has been brealized by using a new bifunctional Takemoto-type thiourea catalyst. The primary Michael adducts obtained were converted in situ to the corresponding amides through the aminolysis. High yields, excellent diastereoselectivities (>95:5 dr), and good enantioselectivities (up to 81% ee) have been achieved for the corresponding α ,β-disubstituted γ-nitroamides. This reaction againdemon strated that α-ketophosphonates are interesting pronucleophiles that can be used as amide surrogates in organocatalyzed reactions.
authors.affiliation: Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0689, United States.
authors.forename: Jie
authors.initials: J
authors.lastname: Guang
authors.forename: John Cong-Gui
authors.initials: JC
authors.lastname: Zhao
keywords: Amide surrogate; Enantioselective; Michael reaction; Nitroalkene; Organocatalysis; α-Ketophosphonate