An efficient base-promoted spirocyclopropanation of 2,3-dioxopyrrolidine derivatives with sulfonium salts is described. This reaction enables a novel concise access to polysubstituted spirocyclopropane derivatives in good yields and with a trans/cis ratio of up to >20:1 under mild conditions.
Key words
spiro compounds - spirocyclopropane - sulfur ylides - sulfonium salt - 2,3-dioxopyrrolidine - heterocycles