Nonmetallic, chiral organic catalysts are used to catalyze an enantioselective aldol coupling reaction between aldehyde substrates. The reaction may be carried out with a single enolizable aldehyde, resulting in dimerization to give a β-hydroxy aldehyde, or trimerization to give a dihydroxy tetrahydropyran. The reaction may also conducted with an enolizable aldehyde and a second aldehyde, which may or may not be enolizable, so that the coupling is a cross-aldol reaction in which the α-carbon of the enolizable aldehyde adds to the carbonyl carbon of the second aldehyde in an enantioselective fashion. Reaction systems composed of at least one enolizable aldehyde, an optional additional aldehyde, and the nonmetallic chiral organic catalyst are also provided, as are methods of implementing the enantioselective aldol reaction in the synthesis of sugars.
使用非
金属手性有机催化剂催化醛底物的对映选择性Aldol偶联反应。该反应可以使用单个可烯化醛进行,产生二聚体以得到β-羟基醛,或三聚体以得到二羟基
四氢吡喃。该反应也可以使用可烯化醛和第二个醛一起进行,第二个醛可以是可烯化的或不可烯化的,使偶联反应成为交叉Aldol反应,其中可烯化醛的α-碳以对映选择性的方式加到第二个醛的羰基碳上。还提供了由至少一个可烯化醛、一个可选的额外醛和非
金属手性有机催化剂组成的反应系统,以及在糖的合成中实施对映选择性Aldol反应的方法。