synthesized via ene–ene metathesisusing the first and second-generation Grubbs catalyst. The ene–ene metathesis proceeded smoothly in refluxing CH2Cl2 with 3.0 mol % of G1, giving good yields (78–86%) of the benzoindolizidine products 12a,b. The benzopyrrolizidine 6 was prepared after optimization in 64% yield by using 5.0+5.0 mol % of G2. The resulting olefin moiety of the indolizidine framework is a suitable