文摘
Selective alkenylation of pyridine is challenging in synthetic organic chemistry due to the poor reactivity and regioselectivity of the aromatic ring. We theoretically investigated Ni-catalyzed selective alkenylation of pyridine with DFT. The first step is coordination of the pyridine–AlMe3 adduct with the active species Nip>(0)p>(NHC)(C2H2) 1 in an ηp>2p>-fashion to form an intermediate Int1. After the isomerization of Int1, the oxidative addition of the C–H bond of pyridine across the nickel–acetylene moiety occurs via a transition state TS2 to form a Nip>(II)p>(NHC) pyridyl vinyl intermediate Int3. This oxidative addition is rate-determining. The next step is C–C bond formation between pyridyl and vinyl groups leading to the formation of vinyl-pyridine (P1). One of the points at issue in this type of functionalization is how to control the regioselectivity. With the use of Ni(NHC)/AlMe3 catalyst, the Cp>4p>- and Cp>3p>-alkenylated products (ΔG°p>⧧p> = 17.4 and 21.5 kcal molp>–1p>, respectively) are formed preferably to the Cp>2p> one (ΔG°p>⧧p> = 22.0 kcal molp>–1p>). The higher selectivity of the Cp>4p>-alkenylation over the Cp>3p> and the Cp>2p> ones is attributed to the small steric repulsion between NHC and AlMe3 in the Cp>4p>-alkenylation. Interestingly, with Ni(P(i-Pr)3)/AlMe3 catalyst, the Cp>2p>-alkenylation occurs more easily than the Cp>3p> and Cp>4p> ones. This regioselectivity arises from the smaller steric repulsion induced by P(i-Pr)3 than by bulky NHC. It is notable that AlMe3 accelerates the alkenylation by inducing the strong CT from Ni to pyridine–AlMe3. In the absence of AlMe3, pyridine strongly coordinates with the Ni atom through the N atom, which increases Gibbs activation energy (ΔG°p>⧧p> = ∼27 kcal molp>–1p>) of the C–H bond activation. In other words, AlMe3 plays two important roles, acceleration of the reaction and enhancement of the regioselectivity for the Cp>4p>-alkenylation.