Hf(OTf)4 as a Highly Potent Catalyst for the Synthesis of Mannich Bases under Solvent-Free Conditions
作者:Shuai-Bo Han、Jing-Ying Wei、Xiao-Chong Peng、Rong Liu、Shan-Shan Gong、Qi Sun
DOI:10.3390/molecules25020388
日期:——
Hf(OTf)4 was identified as a highly potent catalyst (0.1–0.5 mol%) for three-component Mannich reaction under solvent-free conditions. Hf(OTf)4-catalyzed Mannich reaction exhibited excellent regioselectivity and diastereoselectivity when alkyl ketones were employed as substrates. 1H NMR tracing of the H/D exchange reaction of ketones in MeOH-d4 indicated that Hf(OTf)4 could significantly promote the
Hf(OTf)4 被确定为在无溶剂条件下进行三组分曼尼希反应的高效催化剂(0.1-0.5 mol%)。当使用烷基酮作为底物时,Hf(OTf)4 催化的曼尼希反应表现出优异的区域选择性和非对映选择性。酮在 MeOH-d4 中的 H/D 交换反应的 1H NMR 示踪表明 Hf(OTf)4 可以显着促进酮-烯醇互变异构化,从而有助于加快反应速率。