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Tandem ring closing metathesis of 23. (a) TFA (1 equiv), toluene; then 24 (15 mol %), rt. (b) 24 (25 mol %), toluene, 90 °C, 26% yield over 2 steps. (c) CSA (2 equiv), toluene; then 24 (10 mol %), rt, 65%. (d) 24 (3 × 10 mol%), 90 °C, 52% yield over 2 steps. TFA = trifluoroacetic acid; CSA = camphorsulfonic acid; Mes= mesityl.
