4-SUBSTITUTED COUMARIN DERIVATIVES AND PREPARATION METHODS AND USES THEREOF
申请人:CHEN Lijuan
公开号:US20180282315A1
公开(公告)日:2018-10-04
The present invention pertains to the field of chemical medicine, particularly to 4-substituted coumarin derivatives and preparation methods and applications thereof. The invention provides 4-substituted coumarin derivatives with a structural formula as shown in Formula I. The invention also provides preparation methods and applications for the above 4-substituted coumarin derivatives. The compounds provided in the invention have strong anti-tumor activity with IC50 for plural tumor cell lines between 0.01-5 nM, and it also performs better to inhibit microtubule polymerization and has diversified biological activities and low toxicity, providing new options for drug-sensitive and drug-resistant tumor cells.
A novel and convenient method has been developed for the facile synthesis of functionalized succinimide derivatives via intramolecular Alder-ene reaction of 1,6-enynes. This reaction features mild and metal-free reaction conditions, which offers a green and efficient entry to synthetically important succinimide scaffolds. Preliminary mechanistic studies suggest that a diradical intermediate might be
Catalytic Dicyanative 5-exo- and 6-endo-Cyclization Triggered by Cyanopalladation of Alkynes
作者:Shigeru Arai、Yuka Koike、Atsushi Nishida
DOI:10.1002/adsc.200900813
日期:2010.3.22
A stereoselective dicyanative 5‐exo‐ and 6‐endo‐cyclization using various enynes has been investigated. The mode of cyclization is critically controlled by the structure of the substrates. For example, N‐allyl derivatives prefer 5‐exo‐cyclization, while methacryloyl amides are transformed to the corresponding lactams with tetra‐substituted carbons at the alpha‐position via 6‐endo‐cyclization. Both
Anion-accelerated asymmetric Nazarov cyclization: access to vicinal all-carbon quaternary stereocenters
作者:Cody F. Dickinson、Glenn P. A. Yap、Marcus A. Tius
DOI:10.1039/d3ob00735a
日期:——
We have developed a catalytic asymmetric Nazarov cyclization that results in the formation of two contiguous all-carbon quaternarystereocenters in high yield with excellent levels of asymmetric induction. This method requires no catalyst recognition elements in the starting materials that are simple diketoesters. Geometrically pure E or Z isomers of the starting material lead to diastereomerically