Abstract
AbstractUsing chiral phosphoric acids as organocatalysts, a formal asymmetric (4+2) cycloaddition of 3‐methylene isoindolinone and in situ‐generated ortho‐quinone methide substrates is disclosed. This reaction exhibited a broad substrate scope with various substituted cyclic enamides and ortho‐hydroxybenzyl alcohol derivatives to construct a series of spiro chroman‐isoindolinones containing spiro‐N,O‐heterocycles with 56 to 93% ee. This strategy demonstrates significant potential towards establishing a chiral spiro‐N,O‐aminal systems bearing two chiral carbon centers, including a tetrasubstituted carbon stereocenter.magnified image
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