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A bicycle built for two: The title reaction affords cis-fused bicyclo[4.3.0]nonenes from readily available 1,5-bisallenes with structurally diverse propargylic carbonates and arylboronic acids (see scheme; X = NTs, C(E(1))(2) with E(1) = CO(2)Bn, SO(2)Ph, dba = trans,trans-dibenzylidenacetone). The reaction may involve a sequential oxidative addition, two different types of three carbopalladations, and a Suzuki-type coupling.
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Shu et al. (2009) studied this question.
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