Novel oxazaborolidines activated by the strong acid triflimide or AlBr form cationic chiral catalysts. These are effective catalysts for highly regio- and enantioselective Diels-Alder reactions using substituted (E)-4-oxopent-2-enoates as dienophiles.
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| http://dx.doi.org/10.1021/acs.orglett.7b01692 | DOI Listing |
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