Photoreactions of isoindoline-1-thiones with alkenes: unusual formation of tricyclic isoindolines
摘要:
Photochemical cycloaddition reactions of cyclic thioamides and alkenes have been examined. Irradiation of 2-arylisoindoline-1-thiones 1 in the presence of alkenes 2 gave the unexpected tricyclic isoindolines 3-18. The formation of tricyclic isoindolines can best be explained in terms of the intermediacy of aminospirothietane 27, formed by [2 + 2] photocycloaddition of the C=S double bond of 1 to the C=C double bond of 2. Ring cleavage of the resultant amino thietane, assisted by the participation of the nitrogen lone-pair electrons, produced zwitterions 28 and 29 or 1-mercaptoethylisoindole (30). Subsequent nucleophilic attack of the thiol anion on the iminium carbon of 29 or attack of the thiol group on C-3 of 30 gave the final products. Irradiation of isobenzofuran-1-thione (22) and isobenzothiophene-l-thione (23) in the presence of tetramethylethylene (2a) gave the corresponding spirothietanes 24 and 25.
ISOQUINOLINYL AND ISOINDOLINYL DERIVATIVES AS HISTAMINE-3 ANTAGONISTS
申请人:Zhou Dahui
公开号:US20090069300A1
公开(公告)日:2009-03-12
The present invention provides a compound of formula I and the use thereof for the treatment of a central nervous system disorder related to or affected by the histamine-3 receptor.
本发明提供了一种公式I的化合物及其用于治疗与组胺-3受体相关或受其影响的中枢神经系统疾病的应用。
Potassium Hydroxide-Catalyzed Chemoselective Reduction of Cyclic Imides with Hydrosilanes: Synthesis of ω-Hydroxylactams and Lactams
hydroxide‐catalyzed hydrosilylation exhibits excellent activity and chemoselectivity for the reduction of cyclic imides under mild reaction conditions. The chemoselectivity of the reduction system may be readily tuned by changing the identity and stoichiometry of the hydrosilanes: a polymethylhydrosiloxane (PMHS)/potassium hydroxide reduction system resulted in the reduction of various cyclic imides to
[reaction: see text] Aryl- and alkyl-derived azidoacyl radicals, generated from thiolesters by intramolecular homolytic substitution at the sulfur, can undergo five- and six-membered cyclizationonto the azido moiety to give cyclized lactams.
3-N-BUTYL-1-ISOINDOLINONE AND USE THEREOF FOR PREVENTING OR TREATING CEREBRAL INFARCTION
申请人:ZHAO Chunshun
公开号:US20150183738A1
公开(公告)日:2015-07-02
3-n-Butyl-1-isoindolinone and use thereof for preventing or treating cerebral infarction. The compound is prepared by: 1) employing phthalimide as a starting reactant, contacting a nucleophilic Grignard reagent with the original reactant to add an alkyl group to a carbonyl carbon of an amide bond of the original reactant, thus yielding an intermediate; and 2) removing an oxygen atom connected to a third carbon atom of the intermediate in the presence of boron trifluoride diethyl etherate as a catalyst and triethylsilane as a reductant.
A room temperature 3-component cascade process involving nucleophilic substitution/carbonylation/amination, catalysed by palladium nanoparticles generated in situ front palladacycle 5, affords isoindolinones in good yields. The conversions correlate with the pk(a) values of the amines. (C) 2003 Published by Elsevier Ltd.