Highly enantioselective aldol reactions using a tropos dibenz[c,e]azepine organocatalyst
作者:Barry Lygo、Christopher Davison、Timothy Evans、James A.R. Gilks、John Leonard、Claude-Eric Roy
DOI:10.1016/j.tet.2011.09.101
日期:2011.12
The four-step synthesis of a chiral primary tertiary diamine salt, possessing a tropos dibenz[c,e]azepine ring is described. It is shown that 3.5–5 mol % of this salt is capable of promoting highly enantioselective crossed-aldol reactions between cyclohexanone and a series of aromatic aldehydes. In all cases, the aldol reactions proceed with high diastereoselectivity for the anti-aldol product. The
描述了具有对位二苯并[ c,e ] a庚环的手性伯叔二胺盐的四步合成。结果表明,这种盐的3.5–5 mol%能够促进环己酮与一系列芳香醛之间的高度对映选择性的交叉羟醛反应。在所有情况下,羟醛缩合反应继续进行高非对映选择性的反-aldol产品。还描述了涉及其他环状酮和非环状酮的交叉醇醛缩合反应的结果。所有涉及环状酮的例子都会导致对抗羟醛产物的选择性,而发现非环状酮有利于合成-aldol产品。还讨论了手性伯叔二胺盐在醛醇缩合反应催化中的作用。