Highly Versatile Enantioselective Conjugate Addition of Grignard Reagents to α,β-Unsaturated Thioesters
作者:Beatriz Maciá Ruiz、Koen Geurts、M. Ángeles Fernández-Ibáñez、Bjorn ter Horst、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/ol702425a
日期:2007.11.1
for the asymmetric copper-catalyzed conjugate addition of Grignard reagents to alpha,beta-unsaturated thioesters. MeMgBr adds to aromatic alpha,beta-unsaturated thioesters with excellent enantioselectivities and moderate to good yields using Josiphos/CuBr and Tol-BINAP/CuI complexes. The use of bulky Grignard reagents leads to unprecedented enantioselectivities in the 1,4-addition to a broad range
在这里,我们报告了格氏试剂到α,β-不饱和硫代酯的不对称铜催化共轭加成反应的有效催化剂。使用Josiphos / CuBr和Tol-BINAP / CuI配合物,MeMgBr添加到芳族α,β-不饱和硫酯中,具有出色的对映选择性和中等至良好的收率。使用Tol-BINAP / CuI在大范围的芳族和脂族α,β-不饱和硫酯的1,4-加成反应中,使用笨重的格氏试剂会导致空前的对映选择性。使用Tol-BINAP / CuI可以实现目前为止报道的将格氏试剂添加到拥挤的β-取代的脂肪族底物中的最高对映选择性。