Regioselective Synthesis of Pyrroles from Alkyne-Isocyanide Click Reactions: An Angle Strain-Induced Bond Migration Approach
作者:Jimil George、Hun Young Kim、Kyungsoo Oh
DOI:10.1002/adsc.201601017
日期:2016.12.7
direct regioselective synthesis of highly functionalized pyrroles with two different electron‐withdrawing groups has been developed using an angle strain‐induced 1,2‐shift of an electron‐withdrawing group in 2H‐pyrroles. The preferential migration aptitude of an electron‐withdrawing group over alkyl and aryl groups is believed to be the result of the orbital overlap between the internal alkene and the
Silver‐Catalyzed Asymmetric Dearomatization of Electron‐Deficient Heteroarenes via Interrupted Barton–Zard Reaction
作者:Qian Wan、Jia‐Hao Xie、Chao Zheng、Yao‐Feng Yuan、Shu‐Li You
DOI:10.1002/anie.202107767
日期:2021.9
Herein we report a catalytic asymmetricdearomatizationreaction of electron-deficient heteroarenes with α-substituted isocyanoacetates through an interrupted Barton–Zard reaction. A range of optically active pyrrolo[3,4-b]indole derivatives was obtained in good yields (up to 97 %) with high stereoselectivities (up to >20:1 dr and 97 % ee), using a catalytic system consisting of a cinchona-derived
[reaction: see text]. 5-Acylamino butenolides can be assembled by a multicomponent reaction (MCR) of isocyanides, glyoxals, and acetophosphonic acid diethylesters, followed by a intramolecular Wittig-type reaction. The reaction can be performed either in one pot or with the isolation of the intermediate Passerini product. This versatile reaction offers three independent inputs displayed in the final
Polyhydroxy phenols and their use in binding p-selectin
申请人:Biessen Leonardus Erik Anna
公开号:US20060276545A1
公开(公告)日:2006-12-07
Polyhydroxy phenols, which are non-peptidic mimetics of galloyl peptides, and a process for the preparation of gallic acid derivatives using a gallic-acid providing moiety are provided as well as polyhydroxy phenol-containing pharmaceutical and nutraceutical compositions. The use of polyhydroxy phenols as a medicament and especially for the manufacture of a medicament for the prevention, treatment or diagnosis of a disease or a condition, wherein P-selectin is involved, is provided. The same compounds can also be used as targeting tools to P-selectin expressing cells or tissues in a composition, further comprising an active compound in a vehicle.