Concepedia

N-Heterocyclic carbene-catalyzed formal [3 + 3] annulation of alkynoic acid esters with indolin-3-ones: access to functionalized pyrano[3,2-<i>b</i>]indol-2-ones

Kewen Sun, Shiyi Jin, Shuaishuai Fang, Rui Ma, Xinmiao Zhang, Maoyu Gao, Wanqi Zhang, Tao Lu, Ding Du

Organic Chemistry Frontiers · 2019 · 23 citations · 36 references

DOI

Concepts

Abstract

The structurally interesting pyrano[3,2-<italic>b</italic>]indol-2-ones were synthesized by an N-heterocyclic carbene-catalyzed formal [3 + 3] annulation of alkynoic acid esters.

References

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