Scheme 3.

Scope with alcohol and thiol nucleophiles. Yields refer to isolated, pure compounds. 2‐Iodopyridine (1.5 equiv) and triflic anhydride (2 equiv) were added to a solution of the phosphonate (0.2 mmol) in CH₂Cl₂ (4 mL) at 0 °C. After 30 min, TEAC (2.5 equiv) was added at 0 °C. After another 15 min, a solution of deprotonated nucleophile (4 equiv) in THF (2 mL) was added, and the reaction mixture was stirred at room temperature for 18 h. * Tetrabutylammonium chloride was used instead of TEAC. ** 15 mmol scale. Phth=phthalimido.