Ruthenium-Catalyzed Dehydrogenative Functionalization of Alcohols to Pyrroles: A Comparison between Metal–Ligand Cooperative and Non-cooperative Approaches
作者:Amit Kumar Guin、Rakesh Mondal、Gargi Chakraborty、Subhasree Pal、Nanda D. Paul
DOI:10.1021/acs.joc.2c00311
日期:2022.6.3
alcohols to further dehydrogenative functionalization of alcohols to various substituted pyrroles to understand the advantages/disadvantages of the metal–ligand cooperative approach. Various substituted pyrroles were prepared via dehydrogenative coupling of secondary alcohols and amino alcohols, and the N-substituted pyrroles were synthesized via dehydrogenative coupling of aromatic amines with cis-2-butene-1
在此,我们报告了两种钌基钳型催化剂 [ 1 ]X (X = Cl, PF 6 ) 和2 的合成和表征,其中包含两种不同的三齿钳型配体 2-吡唑基-(1,10-菲咯啉) ( L 1 ) 和 2-芳偶氮基-(1,10-菲咯啉) ( L 2a/2b , L 2a = 2-(苯基二氮烯基)-1,10-菲咯啉; L 2b = 2-((4-氯苯基)二氮烯基)-1,10-菲咯啉),以及它们在通过脱氢醇官能化反应合成取代吡咯中的应用。在催化剂 [ 1 ]X (X = Cl, PF 6),三齿支架 2-pyrazolyl-(1,10-phenanthroline) ( L 1 ) 显然是无氧化还原的,所有的氧化还原事件都发生在金属中心,配体仍然是旁观者。相反,在催化剂2a和2b,协调的偶氮芳族支架具有高度的氧化还原活性,并且已知在醇的脱氢过程中积极参与。对这两种催化剂的催化活性进行了比较,从醇的简单脱氢到醇