title: Convenient synthesis of epsilon-halo-beta-ketoesters and gamma,gamma'-dibromoalkanones by regio- and chemoselective reaction of 2-alkylidenetetrahydrofurans with boron trihalides: a "ring-closure/ring-cleavage" strategy.
abstract: [reaction: see text] The reaction of boron tribromide and boron trichloride with 2-alkylidenetetrahydrofurans, readily available on the basis of cyclizations of free and masked dianions with 1,2-dielectrophiles, allowed an efficient synthesis of a variety of carbonyl compounds with remote halide functionality. This includes the chemo- and regioselective synthesis of 6-bromo- and 6-chloro-3-oxoalkanoates and 1,7-dibromoheptan-4-ones. The approach outlined herein can be regarded as a "ring-closure/ring-cleavage" strategy.
authors.affiliation: Institut für Chemie, Universität Rostock, Albert-Einstein-Str. 3a, 18051 Rostock, Germany.
authors.forename: Esen
authors.initials: E
authors.lastname: Bellur
authors.forename: Peter
authors.initials: P
authors.lastname: Langer