R. Grigg et al., Palladium catalysed reactions of allene with active methylene pronucleophiles. C-1,3-dienylmethyl derivatives and their Diels-Alder reactions, TETRAHEDRON, 57(44), 2001, pp. 9187-9197
A 2-step 100% atom economic sequence is reported whereby active methylene p
ronucleophiles react with 2 mol equiv. of allene to give bis-1,3-dienylmeth
yl derivatives of the pronucleophiles. Subsequent double Diels-Alder reacti
ons furnish 1,1'-linked cyclohexenes with a 3-carbon spacer. (C) 2001 Publi
shed by Elsevier Science Ltd.