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Microwave-assisted Regioselective 1-O-deacylation of Peracylated Glycopyranoses on Alumina

Chinese Chemical Letters 2003年第9期14卷 904-906页

作者： Jia Qiang DONG, Shu Jia ZHANG, Yan Guang WANG Department of Chemistry, Zhejiang University, Hangzhou 310027 Department of Chemistry Zhejiang University Hangzhou 310027 China

A facile, rapid and regioselective method for the 1-O-deacylation of peracylated glycopyranoses is described which occurs under mild conditions by absorption onto alumina using microwave irradiation.

关键词： deacylation sugars regioselectivity microwave irradiation.

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Copper Promoted deacylation of Ynones via C-C Bond Activation under Mild Reaction Conditions

Copper Promoted Deacylation of Ynones via C-C Bond Activatio...

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中国化学会·第十六届全国有机合成化学学术研讨会

作者： Lili Feng Tingjun Hu Saisai Zhang 张光武 Heng-Ying Xiong College of Chemistry and Chemical Engineering Henan University 河南大学

Carbon-carbon single bonds are undoubtedly considered as one of the least reactive "functional" groups among a wide range of organic functionalities that can be activated by transition metal complexes. In this paper,the intermolecular deacylative coupling of unstrained ynones via C-C bond activation was realized by a CuCl-bpy system at room temperature to access 1,3-diynes *** method demonstrates good functional group tolerance and wide substrate scope,and is applicable for homo and cross coupling of ynones,giving a range of substituted 1,3-diynes from moderate to excellent ***,the cyclization of selected 1,3-diynes with a sulfur source furnished2,5-disubstituted thiophenes, which are of great interest for material purpose.

关键词： deacylation C-C activation copper ynone 1,3-diynes

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Cu-catalyzed deacylation Arylation of 1H-1,2,3-Benzotriazoles

Cu-catalyzed Deacylation Arylation of 1H-1,2,3-Benzotriazole...

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中国化学会·第十五届全国有机合成化学学术研讨会

作者： Wenying Zhang Yangyang Wang 杜正银 College of Chemistry and Chemical Engineering Northwest Normal University 西北师范大学

Benzotriazole can be found in some bioactive molecules as a nitrogen-containing *** of their interesting structure, high reactivity, and anticancer activity, N-substituted benzotriazoles are widely used in synthetic organic chemistry, materials science, and pharmaceuticals. In the past two decades, hypervalent, λ-iodane organic compounds have been efficiently utilized as successful reagents in organic chemistry. Diaryliodonium salts were used widely in organic synthesis because of their low toxicity, stability, high reactivity, and ***, diaryliodonium salts are particularly important among the quickly growing number of aryliodonium compounds because they afford efficient arylation of diverse nucleophiles, in particular heteroatom *** the other hand,recent applications of diaryluodonium salts have focused on metal-catalyzed arylation reaction under mild *** years, our group achieved the Pd-catalyzed C-H arylation of benzothiazoles and triazoles with diaryliodonium salts to prepare 2-arylbenzothiazoles and 5-aryltriazoles. We reported herein a cheap metal catalysed N-deacylation and thereafter N-arylation of N-acetylbenzothiazoles with diaryliodonium *** reaction was proceeded regioselectively to form N1-arylbenzotriazoles in good to excellent yield under mild conditions.

关键词： deacylation Arylation Diaryliodonium salts 1-H-1,2,3-Benzotriazoles Transition Metal Catalysis

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