Palladium-Catalyzed Cyclization Reaction of <i>o</i>-Iodoanilines, CO<sub>2</sub>, and CO: Access to Isatoic Anhydrides
作者:Wen-Zhen Zhang、Ning Zhang、Yu-Qian Sun、Yu-Wei Ding、Xiao-Bing Lu
DOI:10.1021/acscatal.7b03000
日期:2017.12.1
oxidants. Herein we report a highly selective palladium-catalyzed cyclizationreaction for the efficient synthesis of isatoic anhydrides from readily available o-iodoanilines, CO2, and CO. The reaction proceeds under mild conditions and is redox-neutral. Both CO2 and CO are indispensable C1 building blocks for this catalytic reaction.
Anti-Histaminics of the formula ##SPC1## Wherein R.sub.1 is alkyl, alkenyl or phenalkyl, R.sub.2 and R.sub.3 are hydrogen, alkyl or alkenyl and R and R' are optional are prepared by reacting a 1-substituted isatoic anhydride with a S-methyl-thiopseudourea.
Anti-histaminics of the formula ##SPC1## Wherein R.sub.1 is alkyl, alkenyl or phenalkyl, R.sub.2 and R.sub.3 are alkyl or alkenyl and R and R' are optional are prepared by alkylating or alkenylating a 1-substituted-2-monoalkyl- or alkenylamino-quinazolin-4(1H)-one with an alkyl or alkenyl halide.
The one-pot total synthesis of evodiamine and itsanalogues is achieved using a three-component reaction. Through continuous biscyclization, various readily available substrates with good functional group tolerance were easily incorporated into biologically active quinazolinocarboline backbones. The use of triethoxymethane as a cosolvent was crucial for this quick and straightforward transformation
The chemistry of 2<i>H</i>-3,1-benzoxazine-2,4(1<i>H</i>)dione (isatoic anhydrides) 1. The synthesis of<i>N</i>-substituted 2<i>H</i>-3,1-benzoxazine-2,4(1<i>H</i>)diones
作者:Goetz E. Hardtmann、Gabor Koletar、Oskar R. Pfister
DOI:10.1002/jhet.5570120325
日期:1975.6
Three methods for the preparation of N-substituted 2H-3,1-benzoxazine-2,4(1H)diones (isatoicanhydrides) (1) utilizing 2-chloro-, 2-nitrobenzoic acids and N-unsubstituted isatoicanhydrides as starting materials, are described.
三种制备N-取代的2 H -3,1-苯并恶嗪-2,4(1 H)二酮(乙酸酐)的方法(1)使用2-氯-,2-硝基苯甲酸和N-未取代的等角酸酐作为制备方法描述了起始材料。