2022
DOI: 10.24820/ark.5550190.p011.877
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Highly chemoselective conjugate addition of lithium tetraorganozincates to coumarin derivatives and functionalization with electrophiles

Abstract: The nucleophilic addition (alkylation/arylation) of lithium tetraorganozincate species (R4ZnLi2) to coumarin derivatives takes place cleanly, with a short reaction time (30 min) and with high chemoselectivity, when working under mild conditions (0 °C) and with no additional solvents. Particularly remarkable is the diastereoselectivity of the reaction (up to 96:4), after trapping the resulting intermediates with external electrophiles. The stereochemistry of the major trisubstituted stereoisomer was assigned by… Show more

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