以4,4'-联苯酚、4,4'-二氟二苯砜和新型二氟芳烃单体为原料,制备了一系列新型可交联侧链磺化聚亚芳基醚砜共聚物(S-SPAES( x / y )) 1-(2,6-二氟苯基)-2-(3,5-二甲氧基苯基)-1,2-乙二酮 (DFDMED)通过1,4-丁磺酸内酯的共缩聚、去甲基化和进一步亲核取代。同时,通过S-SPAES( x / y )之间的环缩合得到喹喔啉基交联共聚物(CS-SPAES( x / y ))) 和 3,3'-二氨基联苯胺。可交联的和交联的共聚物膜都表现出良好的机械性能和高的各向异性膜溶胀。离子交换容量 (IEC) 为 2.01 mequiv 的可交联 S-SPAES(1/2)。g -1显示出相对较高的 180 mS cm -1质子电导率和可接受的单电池性能,这归因于其由侧链磺化共聚物结构产生的良好微相分离。与 S-SPAES(1/1) (IEC 为 1.68 mequiv
Pd(II)-Catalyzed Hydroxyl-Directed C−H Olefination Enabled by Monoprotected Amino Acid Ligands
作者:Yi Lu、Dong-Hui Wang、Keary M. Engle、Jin-Quan Yu
DOI:10.1021/ja101909t
日期:2010.4.28
A novel Pd(II)-catalyzed ortho-C-H olefination protocol has been developed using spatially remote, unprotected tertiary, secondary, and primaryalcohols as the directing groups. Mono-N-protected amino acid ligands were found to promote the reaction, and an array of olefin coupling partners could be used. When electron-deficient alkenes were used, the resulting olefinated intermediates underwent subsequent
The synthesis of (±)-pulvilloric acid and of (±) methyl dihydropul-villorate
作者:B. K. Bullimore、J. F. W. McOmie、A. B. Turner、M. N. Galbraith、W. B. Whalley
DOI:10.1039/j39670001289
日期:——
e. Reduction of the latter with sodium borohydride, followed by carboxylation, gave (±)-1-(4-carboxy-3,5-dihydroxyphenyl)-heptan-2-ol. This reacted readily with ethyl orthoformate to give (±)-pulvilloricacid. Carboxylation of the (+)-heptan-2-ol followed by esterification with diazomethane and treatment with dimethoxymethane gave a very low yield of (±)-methyl dihydropulvillorate.
[reaction: see text] A concise synthetic approach toward the haouamines based on Stork-Danheiser alkylation and Friedel-Crafts chemistry is described. A novel electrophilic aromatic substitution with concomitant formation of an enol triflate is reported.
A Powerful New Construction of Complex Chiral Polycycles by an Indium(III)-Catalyzed Cationic Cascade
作者:Karavadhi Surendra、Wenwei Qiu、E. J. Corey
DOI:10.1021/ja204142n
日期:2011.6.29
InI(3) and InBr(3) have been found to be effective catalysts for the π activation of C≡C bonds to initiate the conversion of chiral propargylic alcohols or silyl ethers to polycyclic products in excellent yields and with high stereoselectivity. The method has been applied to the synthesis of chiral fused hexacyclic ring systems with the creation of multiple new stereocenters. The power and scope of
[EN] COMPOUNDS AND METHODS FOR SKIN REPAIR<br/>[FR] COMPOSÉS ET MÉTHODES DE RÉPARATION CUTANÉE
申请人:ALLERGAN INC
公开号:WO2015048553A1
公开(公告)日:2015-04-02
The invention provides compositions and methods for wound healing and scar reduction. The compositions and methods of the invention Include at least one EP4 agonist set forth herein. Wounds and or scars that can be treated by the compositions and methods of the invention can arise from events such as surgery, trauma, disease, mechanical injury, burn, radiation, poisoning, and the like.