Straightforward Strategy for the Stereoselective Synthesis of Spiro-Fused (C-5)Isoxazolino- or (C-3)Pyrazolino-(C-3)quinolin-2-ones from Baylis-Hillman Adducts by 1,3-Dipolar Cycloaddition and Reductive Cyclization
作者:Virender Singh、Vijay Singh、Sanjay Batra
DOI:10.1002/ejoc.200800746
日期:2008.11
A straightforward and general approach for the stereoselectivesynthesis of spiro-fused (C-5)isoxazolino- or (C-3)pyrazolino-(C-3)quinolin-2-onesfrom the adducts offorded from the Baylis–Hillman reaction of 2-nitrobenzaldehyde and ethyl acrylate by sequential 1,3-dipolarcycloaddition and reductivecyclization is presented. It was found that the reductivecyclization of the isoxazoline derivatives