2-Aminoimidazolyl and 2-Aminopyridyl (<i>S</i>)-Prolinamides as Versatile Multifunctional Organic Catalysts for Aldol, Michael, and Diels-Alder Reactions
作者:Manuel Orlandi、Maurizio Benaglia、Laura Raimondi、Giuseppe Celentano
DOI:10.1002/ejoc.201201643
日期:2013.4
organocatalysts, easily obtained by the condensation of (S)-proline with 2-aminopyridine, 2,6-diaminopyridine, or 2-aminoimidazole, is reported. These chiral prolinamides promoted the aldol condensation between cyclohexanone and different aromatic aldehydes with moderate to very high enantioselectivities (up to 98 % ee), depending on the nature of the substituents on the aryl ring. Computational studies
据报道,多功能有机催化剂的合成很容易通过 (S)-脯氨酸与 2-氨基吡啶、2,6-二氨基吡啶或 2-氨基咪唑缩合获得。这些手性脯氨酰胺促进环己酮和不同芳香醛之间的羟醛缩合,具有中等至非常高的对映选择性(高达 98% ee),具体取决于芳环上取代基的性质。进行计算研究以阐明两种不同类型催化剂的立体化学行为,并了解手性脯氨酰胺的不同结构组分在催化剂和反应物之间的识别过程中的作用。在初步实验中,