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Base-promoted annulation reaction yields pyrazinoindolones in high chemoselectivity, indicating effective synthesis methods.
A base‐promoted [4+2] annulation reaction between indole‐2‐carboxamides and vinylsulfonium salts has been developed, affording the pyrazinoindolones in 39%–96% yields with high chemoselectivity. The synthesis strategy of vinylsulfonium salts can also approach to benzimidazole‐fused azabicyclo[3.1.0]hexanes via a [3+2]/[2+1] annulation process with benzimidazole‐derived acrylonitriles as the reaction partners.
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Wang et al. (2026) studied this question.
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