Highly Enantioselective Conjugate Addition of AlMe3 to Linear Aliphatic Enones by a Designed Catalyst
作者:Paul K. Fraser、Simon Woodward
DOI:10.1002/chem.200390087
日期:2003.2.3
of AlMe(3) to linear aliphatic enones in THF at -40 to -48 degrees C in the presence of [Cu(MeCN)(4)]BF(4). At ligand loadings of 5-20 mol %, enantioselectivities of 80-93 % are realised for most substrates. To attain these values, the use of highly pure AlMe(3) is mandatory. The presence of methylalumoxane (MAO), derived by hydrolysis, leads to reduced enantioselectivity and a conjugate addition product
2-羟基-2'-烷硫基-1,1'-联萘化合物是在-40至-48℃,在[ Cu(MeCN)(4)] BF(4)。在5-20mol%的配体负载量下,对于大多数底物实现80-93%的对映选择性。为了获得这些值,必须使用高纯度的AlMe(3)。水解衍生的甲基铝氧烷(MAO)的存在会导致对映选择性和共轭加成产物的降低。