Daia, Dan E, Gabbutt, Christopher D., Heron, B. Mark, Hepworth, John D, Hursthouse, Michael B and Malik, K.M.Abdul (2003) Conjugate additions of lithium dialkynylcuprates [(RCC)2CuLi] to activated chromones. Unexpected formation of the 6H-bis[1]benzopyrano[2,3-b:3′,4′-e]pyridine system. Tetrahedron Letters, 44 (7). pp. 1461-1464. ISSN 0040-4039

Lithium dialkynylcuprates [(RCC)2CuLi], 1a–d, are easily generated and undergo conjugate additions to activated chromones giving 2-alkynylchroman-4-ones 4a–d, 13, 15c,d and 5, however, 1,4-additions to 3 proceed anomalously to give the eneynonitriles 6a–b and the bisbenzopyranopyridine 7.

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