Asymmetric Michael Addition of
<i>N</i>
‐Boc‐Protected Oxindoles to Nitroalkenes Catalyzed by a Chiral Secondary Amine
作者:Chuan Wang、Xuena Yang、Dieter Enders
DOI:10.1002/chem.201200079
日期:2012.4.16
New mission for prolinol ethers: A secondary‐amine‐catalyzedMichaeladdition of N‐Boc‐protectedoxindoles to nitroalkenes through a Brønsted base activation mode has been developed, furnishing the products in excellent yields (88–98 %), diastereoselectivities (d.r.=98:2–>99:1) and high to excellent enantioselectivities (82–>99 % ee; see scheme).