Hf(OTf)4-Catalyzed Three-Component Synthesis of N-Carbamate-Protected β-Amino Ketones
作者:Zhen-Zhen Chen、Dong-Zhao Yang、Ying-Ying Dong、Mei Chi、Shou-Zhi Pu、Qi Sun
DOI:10.3390/molecules27031122
日期:——
been identified as a potent catalyst for the direct three-component synthesis of β-carbamate ketones. This new method, featuring a low catalyst loading, fast reaction rate, and solvent-free conditions, provided facile access to a diversity of carbamate-protected Mannich bases. A mechanistic investigation indicated that the three-component reaction proceeds via sequential aldol condensation and aza-Michael
三氟甲磺酸铪 (IV) (Hf(OTf)4) 已被确定为直接三组分合成 β-氨基甲酸酯酮的有效催化剂。这种新方法具有催化剂负载量低、反应速度快和无溶剂条件等特点,可轻松获得多种氨基甲酸酯保护的曼尼希碱。机理研究表明,三组分反应通过连续的醛醇缩合和氮杂-迈克尔加成进行,而不是曼尼希型途径。