A base‐promoted annulation of 2‐hydrazinyl pyridine and atmospheric pressure of CO₂ has been developed in the presence of silane as reducing reagent, affording a series of triazolones in moderate to excellent yields. CO₂ served as a carbonyl source in this transfomation. Moreover, benzamidrazones also worked well under this procedure. Thus, it represents a green, sustainable and straightforward pathway to access triazolone frameworks.

中文翻译：

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碱促进的2-肼基吡啶和二氧化碳向三唑酮的环化

在硅烷作为还原剂存在下，开发了碱促进的2-肼基吡啶环化反应和大气压下的CO ₂，可提供中等至极好的收率的三唑酮系列。在这种转化过程中，CO ₂用作羰基来源。此外，苯并dra唑酮在该程序下也能很好地工作。因此，它代表了访问三唑酮框架的绿色，可持续和直接途径。