Methods for the catalytic synthesis of highly functionalized benzosulfamidate-fused
tetrahydroquinazolines are presented. The decarboxylative [4+2] cycloaddition of vinyl
benzoxazinanones with benzoxathiazine 2,2-dioxides catalyzed by Pd(PPh3)4 affords fused-tetrahydroquinazolines with high diastereoselectivities. Alternatively,
catalytic asymmetric [4+2] cycloaddition employing a chiral palladium-containing phosphoramidite
ligand provides optically enriched benzosulfamidate-fused tetrahydroquinazolines in
good yields and with excellent diastereoselectivities and enantioselectivities.
Key words
asymmetric catalysis - cycloaddition - vinyl benzoxazinanones - cyclic
N-sulfimines - palladium