Comprehensive Summary We report herein an unprecedented N ‐heterocyclic carbene‐catalyzed formal [3 + 3] annulation of ynals with N ‐Ts indolin‐3‐ones under the oxidation condition affording the functionalized pyrano[3,2‐ b ]indol‐2‐ones. The alkynyl acylazoliums via the combination of a carbene with ynals in the presence of oxidate proved to be the important intermediates for the success of this transformation. This method features a broad substrate scope and mild conditions, including axially chiral skeletons with suitable substitutions.
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Wang et al. (2024) studied this question.
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