A three component catalyst system entailing an amino acid (OtBu-L-threonine), a hydrogen bond donor (sulfamide), and an amine base (DMAP) allows α-branched aldehyde addition to nitroalkenes in good to high yield and excellent ee. Importantly, the lowest reported catalyst loading (5.0 mol%) and aldehyde stoichiometry (1.2–2.0 equiv) is demonstrated and in most instances the best current product profile is observed.
一种由
氨基酸(OtBu-
L-苏氨酸)、氢键供体(
硫酰胺)和胺碱(
DMAP)组成的三组分催化剂体系可使α-支链醛加成到硝基烯烃,产率高且ee值优异。重要的是,该催化剂的负载量(5.0 摩尔%)和醛的
化学计量(1.2-2.0 等量)均达到了报告中的最低
水平,而且在大多数情况下都能观察到最佳的当前产物曲线。