Organocatalyzed enantioselective synthesis of 6-amino-5-cyanodihydropyrano[2,3-c]pyrazoles.
Organocatalyzed enantioselective synthesis of 6-amino-5-cyanodihydropyrano[2,3-c]pyrazoles.
复制标题
DOI:
10.1016/j.tetlet.2009.02.210
复制
发表时间:
2009-05-13
影响因子:
1.8
通讯作者:
Zhao, Cong-Gui
中科院分区:
文献类型:
--
作者:
Gogoi, Sanjib;Zhao, Cong-Gui
关键词:
The first enantioselective synthesis of biologically active 6-amino-5-cyanodihydropyrano[2,3-c]pyrazoles has been achieved through a cinchona alkaloid-catalyzed tandem Michael addition and Thorpe-Ziegler type reaction between 2-pyrazolin-5-ones and benzylidenemalononitriles. The reaction may also be carried out in a three-component or a four-component fashion via the in situ formation of these two components from simple and readily available starting materials. The desired products were obtained in excellent yields with mediocre to excellent enantioselectivities (up to >99% ee).
登录
查看更多内容
影响因子:
15
作者:
Marigo, M;Schulte, T;Jorgensen, KA
通讯作者:
Jorgensen, KA
影响因子:
5.2
作者:
Dudding, T;Hafez, AM;Lectka, T
通讯作者:
Lectka, T
影响因子:
3.5
作者:
Foloppe, Nicolas;Fisher, Lisa M.;Surgenor, Allan E.
通讯作者:
Surgenor, Allan E.
影响因子:
5.1
作者:
Abdelrazek, Fathy M.;Metz, Peter;El-Mahrouky, Sherif F.
通讯作者:
El-Mahrouky, Sherif F.
影响因子:
15
作者:
Biddle, Margaret M.;Lin, Michael;Scheidt, Karl A.
通讯作者:
Scheidt, Karl A.