co-cyclization of a variety of 1-alkynes (R′CCH) and nitriles (R″CN) to pyridine derivatives is reported. Initial reaction rates as well as chemoselectivity and regioselectivity are markedly influenced by the electron donor—acceptor properties of the R groups on the cyclopentadienyl ring, as well as by the steric and electroniceffects induced by the substituents (R′ and R″) attached to substrates.
性质的由式的催化剂前体显示出研究的[Rh(η 5 -C 5 H ^ 4 R)(C 2 H ^ 4)2 ](RNME 2,吨卜中,Me,是H,Cl,NO 2,报道了在各种1-炔烃(R'CCH)和腈(R''CN)的共环化为吡啶衍生物中的CF 3或COOMe)。初始反应速率以及化学选择性和区域选择性受环戊二烯基环上R基团的电子给体-受体性质以及与之连接的取代基(R'和R'')引起的空间和电子效应的显着影响基材。