Stereoselective Synthesis of Densely Functionalized Pyrrolidin-2-ones by a Conjugate Addition/Nitro-Mannich/Lactamization Reaction
作者:James C. Anderson、Lisa R. Horsfall、Andreas S. Kalogirou、Matthew R. Mills、Gregory J. Stepney、Graham J. Tizzard
DOI:10.1021/jo301000r
日期:2012.7.20
Copper-catalyzed conjugate addition of diorgano zinc reagents to nitroacrylate 1 followed by a subsequent nitro-Mannich reaction and in situ lactamization leads to an efficient one-pot synthesis of 1,3,5-trisubstituted 4-nitropyrrolidin-2-ones (5). The versatility of the reaction is shown for a wide range of N-p-(methoxy)phenyl protected aldimines 3 derived from alkyl, aryl, and heteroaryl aldehydes
铜催化的将二有机锌试剂共轭添加到硝酸丙烯酸酯1中,随后进行硝基曼尼希反应和原位内酰胺化,可有效地一锅合成1,3,5-三取代的4-硝基吡咯烷酮-2-酮(5) 。该反应的通用性示出了用于范围广泛的ñ - p - (甲氧基)苯基保护的醛亚胺3选自烷基,芳基,和杂芳基的醛衍生的。致密官能化的吡咯烷酮-2-酮5分离为单一非对映异构体(40个实例,产率33-84%)。二乙基锌的对映选择性铜催化共轭加成导致高度结晶的产物,该产物可以高收率重结晶为对映纯度。研究了一系列成功的化学选择性转化,拓宽了吡咯烷-2-酮作为立体化学纯的结构单元用于进一步有机合成的适用性。