Selective addition of organolithium reagents to BF2-chelates of β-ketoesters
A short, mild, and highly chemoselective addition of organolithium reagents to a BF2 complex of 3-oxopropanoates has been developed. The methodology allows straightforward preparation of various 1,3-dioxa-BF 2 complexes and subsequently leads to the formation of 1,3-diketones starting from the corresponding 3-oxopropanoates.
Stefane, Bogdan
supporting information; experimental part
p. 2900 - 2903
(2010/09/09)
A new and a convenient route to enaminones and pyrazoles
A new method has been developed for the regioselective preparation of enaminones and pyrazoles from 1,3-diketonatoboron difluorides. The reactions proceed smoothly under mild reaction conditions, producing enaminones and pyrazoles in high yields.
Stefane, Bogdan,Polanc, Slovenko
p. 28 - 32
(2007/10/03)
Polycyclic dioxaborin complexes
A process for the production of partially saturated gamma-pyrones of the general formula I: SPC1 wherein R represents hydrogen, hydroxy, lower alkyl, or lower alkoxy and n represents 1 or 2, by reacting a suitably substituted tetralone (IIa) or indanone (IIb) with a boron trifluoride compound and acetic anhydride to obtain intermediate boron complexes III, which are reacted with a Vilsmeier reagent prepared from phosphorus oxychloride and dimethylformamide to obtain the partially saturated gamma-pyrones of formula I. The gamma-pyrones I have anti-allergy and anti-secretory activity.
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(2008/06/13)
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