A Flow Microreactor System Enables Organolithium Reactions without Protecting Alkoxycarbonyl Groups
作者:Aiichiro Nagaki、Heejin Kim、Yuya Moriwaki、Chika Matsuo、Jun-ichi Yoshida
DOI:10.1002/chem.201000876
日期:——
A flowmicroreactor system consisting of micromixers and microtube reactors provides an effective tool for the generation and reactions of aryllithiums bearing an alkoxycarbonyl group at para‐, meta‐, and ortho‐positions. Alkyl p‐ and m‐lithiobenzoates were generated by the I/Li exchange reaction with PhLi. The Br/Li exchange reactions with sBuLi were unsuccessful. Subsequent reactions of the resulting
Antitumor Activity of 5-Aryl-2,3-dihydroimidazo[2,1-a]isoquinolines
作者:William J. Houlihan、Paul G. Munder、Dean A. Handley、Seung H. Cheon、Vincent A. Parrino
DOI:10.1021/jm00002a004
日期:1995.1
A series of 5-aryl-2,3-dihydroimidazo[2,1-a]isoquinolines previously reported to be platelet activating factor (PAF) receptor antagonists were evaluated for potential antitumor activity. Several compounds, such as the 5-(4'-tert-butylphenyl) (65), 5-[4'-(trimethylsilyl)phenyl] (69), and 5-(4'-cyclohexylphenyl) (71) analogs showed very good cytotoxicity against several tumor cell lines. 5-[4'-(Pipe
Palladium-Catalyzed, Copper(I)-Promoted Methoxycarbonylation of Arylboronic Acids with <i>O</i>-Methyl <i>S</i>-Aryl Thiocarbonates
作者:Ya-Fang Cao、Ling-Jun Li、Min Liu、Hui Xu、Hui-Xiong Dai
DOI:10.1021/acs.joc.0c00198
日期:2020.3.20
Here, we report O-methyl S-aryl thiocarbonates as a versatile esterification reagent for palladium-catalyzed methoxycarbonylation of arylboronic acid in the presence of copper(I) thiophene-2-carboxylate (CuTC). The reaction condition is mild, and a variety of substituents including sensitive -Cl, -Br, and free -NH2 could be tolerated. Further applications in the late-stage esterification of some pharmaceutical
There is an increasing demand for facile delivery of silyl groups onto organic bioactive molecules. One of the common methods of silylation via a transition-metal-catalyzed coupling reaction employs hydrosilane, disilane, and silylborane as major silicon sources. However, the labile nature of the reagents or harsh reaction conditions sometimes render them inadequate for the purpose. Thus, a more versatile
New Fluorescence Domain “Excited Multimer” Formed upon Photoexcitation of Continuously Stacked Diaroylmethanatoboron Difluoride Molecules with Fused π-Orbitals in Crystals
structures govern the fluorescence (FL) properties in the crystalline states. The FL domain that is present in type I crystals, in which intermolecular orbital interactions are absent, leads to excited monomer‐like FL properties. In the case of the type II crystals, the presence of intermolecular overlap of the benzene rings π‐orbitals generates new FL domains, referred to as “excitedmultimers”, which possess