Enantioselectivity Switch
in Direct Asymmetric Aminoxylation Catalyzed by Binaphthyl-Based
Chiral Secondary Amines
作者:Keiji Maruoka、Taichi Kano、Akihiro Yamamoto、Fumitaka Shirozu
DOI:10.1055/s-0029-1216635
日期:——
Binaphthyl-based amino acids (S)-1 and an aminosulfonamide (S)-2 were applied for direct asymmetric aminoxylation with nitrosobenzene. In the presence of either (S)-1 or (S)-2, the aminoxylation of aldehydes proceeded smoothly, and subsequent reduction with NaBH4 gave 2-aminoxyl alcohols with good to excellent enantioselectivities. In each case, binaphthyl-based chiral amine catalysts (S)-1 and (S)-2
联萘基氨基酸(小号) - 1和氨基磺酰胺(小号) - 2施加与亚硝基苯直接不对称aminoxylation。在(S)-1或(S)-2的存在下,醛的氨氧基化进行顺利,并且随后用NaBH 4还原得到具有良好或优异的对映选择性的2-氨基二甲苯醇。在每种情况下,基于双萘基的手性胺催化剂(S)-1和(S)-2具有相同的轴向手性的化合物,以相反的对映体为主要产物。该方法代表了非脯氨酸型催化剂直接不对称氨氧化的罕见例子。 烯胺催化-不对称氨氧化-有机催化剂