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<p>Phosphazene superbases have emerged as a pivotal class of metal-free organic catalysts, demonstrating remarkable versatility and efficiency in modern synthetic chemistry. This review systematically summarizes the catalytic applications of P4-<i>t</i>-Bu, a prominent member of the phosphazene superbase family, across diverse organic transformations over the past fifteen years. Key reactions include copolymerization of epoxides with dihydrocoumarins, cyclization processes (e.g., benzofuran synthesis and iodoaminocyclization), and nucleophilic substitutions of fluorinated and methoxylated aromatics. Through a comprehensive analysis, we highlight P4-<i>t</i>-Bu’s unique advantages as a green catalyst, such as its exceptional basicity, broad substrate compatibility, and operational simplicity under mild conditions. Mechanistic insights into its high regio- and stereoselectivities are also discussed. By critically evaluating recent advances and current limitations, this review aims to serve as a valuable resource for researchers developing sustainable catalytic methodologies in organic synthesis, while outlining future directions for phosphazene superbase applications.</p>

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Phosphazene superbase P4-t-Bu: a versatile and efficient catalyst in morden organic synthesis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月6日

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  • Yue-Jie Diao,
  • Tian-Hua Zheng,
  • Ping-Gui Li,
  • Liang-Hua Zou

摘要

Phosphazene superbases have emerged as a pivotal class of metal-free organic catalysts, demonstrating remarkable versatility and efficiency in modern synthetic chemistry. This review systematically summarizes the catalytic applications of P4-t-Bu, a prominent member of the phosphazene superbase family, across diverse organic transformations over the past fifteen years. Key reactions include copolymerization of epoxides with dihydrocoumarins, cyclization processes (e.g., benzofuran synthesis and iodoaminocyclization), and nucleophilic substitutions of fluorinated and methoxylated aromatics. Through a comprehensive analysis, we highlight P4-t-Bu’s unique advantages as a green catalyst, such as its exceptional basicity, broad substrate compatibility, and operational simplicity under mild conditions. Mechanistic insights into its high regio- and stereoselectivities are also discussed. By critically evaluating recent advances and current limitations, this review aims to serve as a valuable resource for researchers developing sustainable catalytic methodologies in organic synthesis, while outlining future directions for phosphazene superbase applications.