Photochemical Aryl Radical Cyclizations to Give (E)-3-Ylideneoxindoles

Abstract

(E)-3-Ylideneoxindoles are prepared in methanol in reasonable to good yields, as adducts of photochemical 5-exo-trig of aryl radicals, in contrast to previously reported analogous radical cyclizations initiated by tris(trimethylsilyl)silane and azo-initiators that gave reduced oxindole adducts.

Keywords

• cyclization
• heterocycle
• oxindole
• UV-light