Ruthenium Complex-catalyzed Highly Selective Co-oligomerization of Alkenes

摘要

Ruthenium complex-catalyzed reactions often require highly qualified tuning of reaction conditions with substrates to attain high yield and selectivity of the products.In this review,our strategies for achieving characteristic ruthenium complex-catalyzed co-oligomerization of different alkenes are disclosed:1) The codimerization of 2-norbornenes with acrylic compounds by new ruthenium catalyst systems of RuCl3(tpy)/Zn [tpy=2,2':6',2"-terpyridine] or [RuCl2(eta~6-C6H6)]2/Zn in alcohols,2) A novel synthesis of 2-alkylidenetetra-hydrofurans from dihydrofurans and acrylates by zerovalent ruthenium catalysts,such as Ru(eta~4-cod)(eta~6-cot) [cod=1,5-cyclooctadiene,cot=1,3,5-cyclooctatriene] and Ru(eta~6-cot)(eta~2-dmfm)2 [dmfm=dimethyl fumarate],3) Regio-and stereoselective synthesis of enamides by Ru(eta~6-cot)(eta~2-dmfm)2-catalyzed codimerization of N-vinylamides with alkenes,and 4) Unusual head-to-head dimerization of styrenes and linear codimerization of styrenes with ethylene by Ru(eta~6-cot)(eta~2-dmfm)2 catalyst in the presence of primary alcohols.