equiv of chiral binol-derived organophosphoric acid and 1 equiv of Et2AlCl. In the presence of a catalytic amount of [4j]2Al(III)Cl complex (0.05 equiv), reaction between α-isocyanoacetamides (2) and aldehydes (3) afforded the corresponding 5-aminooxazoles (1) in good yields and enantioselectivities. Complex [4j]2Al(III)Cl isolated as a white solid displayed similar reactivity as that prepared in situ.
通过混合2当量的手性二元醇衍生的有机
磷酸和1当量的Et 2 AlCl来制备手性
路易斯酸催化剂。在催化量的[ 4j ] 2 Al(III)Cl配合物(0.05当量)存在下,α-异
氰基乙酰胺(2)与醛(3)之间的反应以良好的收率和对映选择性提供了相应的
5-氨基恶唑(1)。 。分离为
白色固体的复合物[ 4j ] 2 Al(III)Cl显示出与原位制备的相似的反应活性。