The direct enantioselective amination of nitroolefins has been performed with L-tert-leucine-derived squaramide-scaffold bifunctional phase-transfer catalysts under base-free and water-rich conditions with low catalyst loading (0.5–1 mol%) to provide 2-aminonitroalkanes in good yields (up to 96%) and enantioselectivities (up to 93% ee).
nitroolefins的直接对映选择性胺化已经进行大号-叔具有低催化剂载量(0.5-1摩尔%),得到2- aminonitroalkanes基-自由和富含
水的条件下-亮
氨酸衍生squaramide脚手架双官能的相转移催化剂具有良好的收率(高达96%)和对映选择性(高达93%ee)。