Being an abundant, easily available, and renewable one-carbon source, carbon dioxide has received much attention in organic synthesis. However, carbon dioxide is a thermodynamically inert molecule that is hard to incorporate into useful chemicals. Nevertheless, various elegant methods have been developed for the incorporation of carbon dioxide in a number of heterocycles. In this review, we summarize and update the recent advances in n - dig -cyclization of alkynes involving the fixation of CO 2 , including the 5- dig - and 6- dig -cyclization of alkynes. 1 Introduction 2 The 5- dig -Cyclization of Alkynes 3 The 6- dig -Cyclization of Alkynes 4 Conclusion

中文翻译：

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涉及固定 CO2 的炔烃的 n-dig-环化 (n = 5, 6)

二氧化碳作为一种丰富、易得且可再生的单碳源，在有机合成中备受关注。然而，二氧化碳是一种热力学惰性分子，很难融入有用的化学品中。尽管如此，已经开发了各种优雅的方法来将二氧化碳掺入许多杂环中。在这篇综述中，我们总结并更新了炔烃 n - dig - 环化涉及 CO 2 固定的最新进展，包括炔烃的 5- dig - 和 6- dig - 环化。1 引言 2 炔烃的 5-dig -环化 3 炔烃的 6-dig -环化 4 结论