Chiral Calcium Iodide for Asymmetric Mannich-type Reactions of Malonates with Imines Providing β-Aminocarbonyl Compounds
作者:Tetsu Tsubogo、Shota Shimizu、Shū Kobayashi
DOI:10.1002/asia.201300102
日期:2013.5
catalytic asymmetric Mannich‐type reactions of malonates with both N‐Boc‐protected aromatic and aliphatic imines, and resulted in moderate to high yields with high enantioselectivities. To the best of our knowledge, this is the first example of highly enantioselective metal‐catalyzed asymmetric Mannich‐type reactions of malonates with N‐Boc‐protected aliphatic imines. The Mannich adduct was successfully
开箱即用:我们从CaI 2开发了一种新型手性碘化钙催化剂,并开发了一种在湿气和氧气下均稳定的pybox。该催化剂可用于丙二酸酯与N -Boc保护的芳族和脂族亚胺的催化不对称曼尼希型反应,可产生中等到高收率,并具有高对映选择性。据我们所知,这是丙二酸酯与N -Boc保护的脂族亚胺的高对映选择性金属催化的不对称曼尼希型反应的第一个例子。曼尼希加合物已成功转化为α-羟基β-氨基酸衍生物。我们还显示了具有丙二酸酯的手性Ca络合物的独特结构。