Table 2. Scope of the Catalytic Carbyne Transfer with Alkenyl Carboxylic Acids^a,^b.

^aPerformed with 1 (0.20 mmol, 1 equiv), 2a (0.26 mmol, 1.3 equiv), and Rh₂(esp)₂ (0.006 mmol, 3 mol %) in CH₂Cl₂ (0.08 M). Yields are reported on the basis of isolated pure product.

^bThe diastereoselectivity ratio indicated in parentheses was determined by ¹H NMR analysis of the reaction crude mixture. NPhth = phthalimide.

^cReaction performed at 0 °C.