Abstract
A three-ring circus: The FeCl3- and FeBr3-mediated tandem cyclization of diynes with diethyl benzaldehyde acetals to form fused tricyclic indenes has been accomplished (see scheme). The consecutive formation of three new CC bonds allows the formation of 3-halovinyl-2,3-disubstituted or 1-methylene-2,3-disubstituted 1H-indene derivatives under mild conditions. This protocol provides a new route to highly functionalized indene derivatives.
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