A facile approach to spiro[dihydrofuran-2,3'-oxindoles] via formal [4 + 1] annulation reaction of fused 1H-pyrrole-2,3-diones with diazooxindoles

• Pavel A. Topanov,
• Anna A. Maslivets,
• Maksim V. Dmitriev,
• Irina V. Mashevskaya,
• Yurii V. Shklyaev and
• Andrey N. Maslivets

Beilstein J. Org. Chem. 2022, 18, 1532–1538, doi:10.3762/bjoc.18.162

• heterocyclic systems are heteroanalogues of antimicrobial and antibiofilm fungal metabolites. The developed reaction represents the first example of involving 1H-pyrrole-2,3-diones fused at the [e]-side in a [4 + 1] annulation reaction. Keywords: [4 + 1] annulation; catalyst-free; diazooxindole; 1H-pyrrole

• ]. With diazooxindoles used as the diazo component, it is possible to obtain the desired spirofuranoxindoles. To date, only one method is known for obtaining spirofuranoxindoles from diazooxindole and an enone, where p-quinone methide acts as the enone, but the reaction requires the use of a catalyst [24

• be unknown. To evaluate the possibility of synthesizing the target spirooxindole compounds, we initially investigated a reaction of benzoxazine-containing FPD 1a with diazooxindole 2a in anhydrous acetonitrile at room temperature (Scheme 3). The reaction came to an end in 24 hours, with the color of