Intermolecularhydroacylation between salicylaldehydes 1, 26−40 and 1,4-penta- or 1,5-hexadienes 4−13 by Rh-catalyst proceeded under mild reaction conditions to give a mixture of iso- and normal-hydroacylated products 14−25, 41−55, and 57−60. In the hydroacylationreaction, chelation of both salicylaldehyde and diene to the Rh-complex plays a crucial role. The ratio of iso- and normal-hydroacylated
The carbocyclization of non‐conjugated dienesmediated by organometallics is an important reaction for the synthesis of a variety of carbocyclic derivatives, but the direct annulation of dienes with an inert C−H bond of a substrate has remained unexplored to date. We herein report a series of novel rare‐earth dialkyl complexes bearing a phosphinoamide anion and demonstrate that the combination of a
Sequential cyclization-silylation reactions of 1,1-disubstituted alkenes catalyzed by a cationic zirconocene complex
作者:Gary A. Molander、Christopher P. Corrette
DOI:10.1016/s0040-4039(98)00981-2
日期:1998.7
A catalytic method for the sequential cyclization-silylation of dienes containing one or two 1,1-disubstituted alkene moieties to form various cyclic and bicyclic organosilanes in good yield is presented.
5-hexadiene complex of cationic ruthenium was obtained by regiospecific C4 homologation at the internal carbon atom of the non-conjugated diene. This stoichiometric CC bonding was extended to the catalyticcodimerization and stepwise oligomerization of butadiene with 1,5-hexadiene or 1-hexene.
regio- and diastereoselective cyclization/hydroarylation reaction of 1,5- and 1,6-dienes with aromatic ethers and tertiary anilines was established by a cationic 2-picoline-tethered-half-sandwich scandium alkyl catalyst, which constitutes a process for producing a diverse array of cis-1,3-disubstituted arylated and trans-1,2-disubstituted benzylated methylcyclopentanederivatives in one step with 100% atom-efficiency