Structure-Reactivity Studies of Simple 4-Hydroxyprolinamide Organocatalysts in the Asymmetric Michael Addition Reaction of Aldehydes to Nitroolefins
作者:John Watts、Lien Luu、Vickie McKee、Ed Carey、Fintan Kelleher
DOI:10.1002/adsc.201100028
日期:2012.4.16
A series of simple 4‐hydroxyprolinamides was synthesised and they were found to act as organocatalysts for the asymmetric conjugate addition of aldehydes to nitroolefins in excellent yields (98%), with complete diastereoselectivity (99:1, syn:anti) and enantioselectivity (98% ee for syn). Furthermore, the use of low catalyst loadings (5 mol%) and a low aldehyde molar excess (1.5 equivalents) were achieved
合成了一系列简单的4-羟基脯氨酰胺,发现它们可以作为有机催化剂,以极高的收率(98%),全非对映选择性(99:1,syn:anti)和对映选择性(98)将醛不对称共轭加成至硝基烯烃。%ee,代表syn)。此外,实现了低催化剂负载量(5mol%)和低醛摩尔过量(1.5当量)的使用。