Diels-Alder additions of benzynes within helicene skeletons.
Although the contortions required are unprecedented, the benzynes formed by the fluoride-induced elimination of TMSOTf from o-trimethylsilyl [6]- and [7]-helicenol triflates add to another ring of the helicenes rather than to an external furan molecule.
Wang
David Zhigang
DZ
Department of Chemistry, Columbia University, New York, New York 10027, USA.
Katz
Thomas J
TJ
Golen
James
J
Rheingold
Arnold L
AL