Copper-catalyzed enantioselective Mukaiyama aldol reaction of silyl enol ethers with isatins
作者:Jindong Li、Yanan Li、Jianan Sun、Yang Gui、Yekai Huang、Zhenggen Zha、Zhiyong Wang
DOI:10.1039/c9cc02159k
日期:——
A highly enantioselective Mukaiyama aldol reaction of silylenolethers with isatins catalyzed by chiral copper complexes was developed. A series of chiral 3-substituted 3-hydroxy-2-oxindoles bearing a tetra-substituted center could be obtained exclusively with high yields (up to 95%) and excellent enantioselectivities (up to 99%). In particular, water was essential to improve the diastereoselectivity
In the presence of molecular sieve (MS) 4 Å in DMF, a catalyst-free aldol condensation of a variety of aromatic and aliphatic ketones with isatins under mild reaction conditions has been developed. This approach may provide access to a wide range of 3-substituted-3-hydroxyindolin-2-ones in good to excellent yields.