Palladium-Catalyzed Decarboxylative [4+2] Cycloaddition of Vinyl Benzoxazinanones with Cyclic N-Sulfimines: Stereoselective Synthesis­ of Benzosulfamidate-Fused Tetrahydroquinazolines

Abstract

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

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