Asymmetric organocatalytic Michael addition of cyclopentane-1,2-dione to alkylidene oxindole
作者:Estelle Silm、Ivar Järving、Tõnis Kanger
DOI:10.3762/bjoc.18.18
日期:——
An asymmetric Michael reaction between cyclopentane-1,2-dione and alkylidene oxindole was studied in the presence of a multifunctional squaramide catalyst. Michael adducts were obtained in high enantioselectivities and in moderate diastereoselectivities.
在多功能方酰胺催化剂存在下,研究了 cyclopentane-1,2-dione 和亚烷基羟吲哚之间的不对称 Michael 反应。迈克尔加合物以高对映选择性和中等非对映选择性获得。
Construction of Pyrrolidinyl Spirooxindoles via a 1,3-Dipolar Cycloaddition Reaction of (<i>E</i>)-<i>N</i>-Boc-3-Alkylidene-Indolin-2(3<i>H</i>)ones with Azomethine Ylides
作者:Zhang-Biao Yu、Xiong-Li Liu、Bo-Wen Pan、Bin Chen、Ying Zhou、Hua-Lin Wang
DOI:10.1080/00397911.2013.820834
日期:2014.2.16
A mild and efficient method for the construction of pyrrolidinyl spirooxindoles via a 1,3-dipolar cycloaddition reaction of (E)-N-Boc-3-alkylidene-indolin-2(3H)ones with azomethine ylides has been established. The presence of an N-Boc group in the indolin-2(3H)ones obviously increased the activity and stereoselectivity of the reaction, affording the desired pyrrolidinyl spirooxindoles 4 with up to 85% yield and up to >99/1 dr value. Furthermore, the antibacterial activity of these compounds against Staphylococcus aureus (ATCC-25825) has been tested at minimum concentration, and some of them exhibit moderate antibacterial activity. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) for the following free supplemental resource(s): Full experimental and spectral details.]