An Effective Use of Benzoic Anhydride and Its Derivatives for the Synthesis of Carboxylic Esters and Lactones: A Powerful and Convenient Mixed Anhydride Method Promoted by Basic Catalysts
4-(dimethylamino)pyridine. A similar reaction occurs with triethylamine when using a catalytic amount of 4-(dimethylamino)pyridine 1-oxide as an effective promoter for the intramolecular condensation reaction. These methods are successfully applied to the synthesis of erythro-aleuritic acid lactone and an eight-membered-ring lactone moiety of octalactins A and B. The efficiency of the cyclizations is
Regiospecific synthesis of 2-methyl-4-arylcarbonyl-2<i>H</i>-1, 2-benzothiazin-3(4<i>H</i>)-one 1, 1-dioxides
作者:A. Marfat、R. J. Chambers
DOI:10.1002/jhet.5570260361
日期:1989.5
Acylation of 2-methyl-2H-1, 2-benzothiazin-3(4H)-one1, 1-dioxide 3 with aryl anhydrides in the presence of dimethylaminopyridine occurs regiospecifically to afford 2-methyl-4-arylcarbonyl-2H1, 2-benzothiazin-3(4H)-one1, 1-dioxides 2a-f.
在二甲基氨基吡啶的存在下,使用芳基酸酐将2-甲基-2 H -1、2-苯并噻嗪-3(4 H)-1、1-二氧化物3酰化,从而区域选择性地生成2-甲基-4-芳基羰基-2 H 1,2,2-苯并噻嗪-3(4 H)-one 1,1-dioxides 2a-f。
A palladium-catalyzed addition reaction of aroyl/heteroaroyl acid anhydrides to norbornenes
作者:Mieko Arisawa、Saori Tanii、Masahiko Yamaguchi
DOI:10.1039/c4cc07759h
日期:——
A palladium complex derived from Pd2(dba)3 and dppp catalyzes the addition reaction of aroyl/heteroaroyl acid anhydrides to norbornenes, giving 2-aroyl/heteroaroyl-3-aroyloxy/heteroaroyloxy-bicyclo[2,2,1]heptanes.
Substituted oxophthalazinyl acetic acids and analogs thereof
申请人:PFIZER INC.
公开号:EP0436307A1
公开(公告)日:1991-07-10
Substituted oxophthalazinyl acetic acids having aldose reductase inhibitory activity have the formula
wherein A¹, A², B, R¹, R² and R³ are specifically defined, including the pharmaceutically acceptable base salts thereof when R¹ is hydrogen, and certain intermediates therefor.