TY - JOUR A1 - Vepreva, Anastasia A1 - Yanovich, Alexander A1 - Dar'in, Dmitry A1 - Kantin, Grigory A1 - Bunev, Alexander A1 - Krasavin, Mikhail T1 - Novel spirocyclic scaffold accessed via tandem Claisen rearrangement – intramolecular Michael addition JF - Beilstein Archives Y1 - 2022/// SN - M3 - doi:10.3762/bxiv.2022.83.v1 N2 - A straightforward access to novel spiro[benzofuran-2,3'-pyrrolidine]-2',5'-diones based on Rh2(esp)2-catalyzed insertion of carbenes derived from  diazo arylidene succinimides (DAS) into O-H bond of phenols is described. The initial adducts underwent a thermally promoted Claisen rearrangement followed by DABCO-catalyzed intramolecular 5-exo-dig Michael addition. ER -