Construction of diverse steric disulfides^a,b.

^aReaction conditions: β-keto ester (0.1 mmol), N-dithiophthalimide (0.12 mmol) and DMAP (0.02 mmol) in CH₂Cl₂ (1 mL) were stirred at room temperature for 12–24 h.

^bIsolated yields.

^cTMS enol ethers were used instead of the corresponding β-keto esters.

^dReaction conditions: TMS ketene acetal (0.2 mmol), N-dithiophthalimide (0.4 mmol), and DMAP (0.04 mmol) in THF (2 mL) were stirred at room temperature for 8–12 h.

^e0.1 mmol of DMAP were used.