专利号:US-4523022-A 优先权日:1983-07-07 标 题:Analogs of the antibiotic spectinomycin 发明人:THOMAS RICHARD C 权利人:UPJOHN CO 摘要:The present invention concerns the novel, sugar-ring expansion for synthesis of novel analogs of spectinomycin or C-6' analogs of spectinomycin from known aminomethyldihydrospectinomycin and analogs thereof. Additionally, the invention concerns the novel synthesis of novel 7 membered sugar-ring analogs of dihydrospectinomycin and C-6' analogs thereof from novel 7 membered sugar-ring spectinomycin and C-6' analogs thereof by treatment with NaBH4.
专利号:US-11040939-B1 优先权日:2020-06-23 标 题 :N-transfer reagent and method for preparing the same and its application 发明人:CHOU HO-HSUAN; LU GUAN-HAN; HSUEH HSIAO-CHIN; HUANG TZU-CHIA 权利人:UNIV NAT CHENG KUNG 摘要:Provided are a novel N-transfer reagent and a method for preparing the same and its application. The N-transfer reagent is represented by the following Formula (I): n n n n n n n n n n The various novel N-transfer reagents of the present invention can be quickly prepared by employing different nitrobenzene precursors. The N-transfer reagents can directly convert a variety of amino compounds into diazo compounds under mild conditions. Particularly, the N-transfer reagents can facilitate the synthesis of the diazo compounds. The application of synthesizing diazo compounds of the present invention can greatly decrease the difficulty in operation, increase the safety during experiments, reduce the cost of production and the environmental pollution, and enhance the industrial value of diazo compounds.
专利号:US-4107183-A 优先权日:1975-12-08 标 题:Synthesis of optically active carboxylic acid esters
专利号:US-7301045-B2 优先权日:2000-10-16 标 题 :Method for preparing ester condensate 发明人:ISHIHARA KAZUAKI; YAMAMOTO HISASHI 权利人:JAPAN SCIENCE & TECH CORP 摘要:The present invention provides a method for preparing ester or thioester that can conduct catalytic esterification reaction with an equimolar amount of carboxylic acid and alcohol, or catalytic thioesterification reaction with carboxylic acid and an equimolar amount or small amount of thiol, and can be expected as an industrial method that needs an enormous amount of synthesis in the light of green chemistry. By using hafnium chloride (IV), especially tetravalent hafnium compounds represented by hafnium chloride (IV)·(THF) 2 or hafnium (IV)t-butoxide as a (poly) condensation catalyst, direct condensation reaction is conducted from carboxylic acid and an equimolar amount of alcohol or a little smaller amount of thiol, in the nonpolar solvent such as toluene and the like, in a deoxidization atmosphere and under heating reflux, and the reaction synthesizes ester monomer or thioester monomer, polyester or polythioester. When heating reflux is conducted by using a nonpolar solvent, it is preferable to remove azeotropic water from the reaction system.