Purahong N.Teerawatananond T.Chotsaeng N.Janthakit P.Nalaoh P.Promarak V.Kuhakarn C.Meesin J.Mahidol University2025-02-172025-02-172025-01-01Asian Journal of Organic Chemistry (2025)https://repository.li.mahidol.ac.th/handle/20.500.14594/105327This work reports a new route for the synthesis of 3-(9H-fluoren-9-ylidene)indolin-2-one derivatives via the reaction of 3-chlorooxindoles and O-ethyl S-(9H-fluoren-9-yl) carbonodithioates mediated by 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU). The reactions readily proceeded at room temperature, enable a collection of 3-alkenyl oxindoles to be prepared within a short reaction time (15 minutes). The 3-alkenyl oxindoles can be easily converted to 3-fluorenyl oxindoles by NaBH4 reduction.ChemistryArticleSCOPUS10.1002/ajoc.2024006602-s2.0-8521742648821935815