title: Sequential reactions of trimethylsilyldiazomethane with 4-alkenyl ketones and aldehydes catalyzed by Lewis bases.
abstract: A sequence of a carbonyl addition between 4-alkenyl ketones and aldehydes with trimethylsilyldiazomethane followed by a 1,3-Brook rearrangement and an intramolecular 1,3-dipolar cycloaddition was promoted by Lewis bases tetrabutylammonium triphenyldifluorosilicate (TBAT) or potassium tert-butoxide (KO-t-Bu). Through these concatenated bond-forming processes, a variety of novel bi- and tricyclic Δ(1)-pyrazolines were synthesized.
authors.affiliation: Department of Chemistry, University of Illinois at Chicago , 845 West Taylor Street, Chicago, Illinois 60607, United States.
authors.forename: Huaqing
authors.initials: H
authors.lastname: Liu
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: O'Connor
authors.forename: Chunrui
authors.initials: C
authors.lastname: Sun
authors.forename: Donald J
authors.initials: DJ
authors.lastname: Wink
authors.forename: Daesung
authors.initials: D
authors.lastname: Lee