Oxa- and azabenzonorbornadienes react with alkynes in the presence of nickel complexes to give the corresponding [2+2+2] cycloadducts; these reactions can be applied to the construction of multiple fused rings, the preparation of precursors of isobenzofurans and isoindoles and aromatic compounds.
No takes yet. Share an insight, caveat, or question.
Huang et al. (1998) studied this question.