α‑Regioselective Asymmetric [3 + 2] Annulations of Morita–Baylis–Hillman Carbonates with Cyclic 1‑Azadienes and Mechanism Elucidation
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资源简介:
An
α-regio-, diastereo-, and enantioselective [3 + 2] annulation
reaction of Morita–Baylis–Hillman carbonates of isatins
and activated alkenes with a bulky electron-withdrawing 1,2-benzoisothiazole
1,1-dioxide or 1,2,3-benzoxathiazine 2,2-dioxide motif is reported,
furnishing an array of spirooxindoles (>19:1 dr, up to >99%
ee) catalyzed
by cinchona-derived tertiary amines. Density functional theory calculation
studies have been conducted to elucidate the originality of the α-regioselective
annulations.
创建时间:
2016-02-12



