Thiourea-catalyzed asymmetric domino Michael-cyclization reaction of 3-isothiocyanato oxindoles with β,γ-unsaturated α-keto esters for the synthesis of spirocyclic oxindoles
作者:Mei Bai、Yong-Zheng Chen、Bao-Dong Cui、Xiao-Ying Xu、Wei-Cheng Yuan
DOI:10.1016/j.tet.2019.02.036
日期:2019.4
A reaction between 3-isothiocyanato oxindoles and β,γ-unsaturated α-keto esters catalyzed by a chiral thiourea organocatalyst via a domino Michael-cyclization process is described, which delivers a range of biologically important 2′-thioxospiro[indoline-3,4′-oxazolidin]-2-one compounds in high yields with good diastereo- and enantioselectivities (up to 99% yield, >99:1 dr, >99% ee). Moreover, two of
描述了3-异硫氰酸根合吲哚与手性硫脲有机催化剂通过多米诺迈克尔-环化反应催化的β,γ-不饱和α-酮酸酯之间的反应,该反应提供了一系列生物学上重要的2'-硫代氧杂螺[indoline-3,4 '-恶唑烷酮] -2-酮化合物,高收率,具有良好的非对映选择性和对映选择性(最高收率99%,> 99:1 dr,> 99%ee)。此外,在初步的生物学评估中,发现2个2'-thioxospiro [吲哚啉-3,4'-恶唑烷] -2-one化合物在抗炎活性中具有显着的作用。