[EN] A NEW METHOD OF 18F LABELLING AND INTERMEDIATE SALTS<br/>[FR] NOUVEAU PROCÉDÉ D'ÉTIQUETAGE DE 18F ET DE SELS INTERMÉDIAIRES
申请人:NAT UNIV SINGAPORE
公开号:WO2021126080A1
公开(公告)日:2021-06-24
Disclosed herein is a salt of formula I: where R1, X, n, R, R1, Y, m, p, q, Z and o are as defined herein. Also disclosed herein are methods of using said salts in chemical synthesis, such as to prepare compounds isotopically enriched in 18F for use in PET imaging, as well as methods to make the compounds of formula I.
Frustrated Lewis-Pair-Meditated Selective Single Fluoride Substitution in Trifluoromethyl Groups
作者:Dipendu Mandal、Richa Gupta、Amit K. Jaiswal、Rowan D. Young
DOI:10.1021/jacs.9b12167
日期:2020.2.5
developed a generic protocol that allows a single substitution of one fluoride in trifluoromethylgroups with neutral phosphine and pyridine bases. The resulting phosphonium and pyridinium salts can be further functionalized via nucleophilic substitution, photoredox coupling and electrophilic transfer reactions allowing the generation of a vast array of difluoromethyl products.
Palladium-catalysed cyclisation of 2-substituted halogenoarenes by dehydrohalogenation
作者:D.E. Ames、A. Opalko
DOI:10.1016/s0040-4020(01)91149-4
日期:1984.1
satisfactory system being palladium(II) acetate in NN-dimethylacetamide (DMA) with sodium carbonate as base) has been examined as a route to some heterocyclicsystems. Whereas dehydrogenativecyclisation processes require stoichiometric amounts of palladium(II) reagent, the present procedure involves only catalytic amounts (0.1 molar proportion, or less), of palladium compound. The preparation of dibenzofuran
N-heterocyclic carbene-catalyzed intramolecular aza-Michael addition of alkyl amines to α,β-unsaturated carboxylic acid: Synthesis of pyrrolidines and piperidines
作者:Zhao-Fei Zhang、Zhong-Hua Gao、Chun-Lin Zhang、Song Ye
DOI:10.1016/j.tet.2021.132337
日期:2021.8
carbene-catalyzed intramolecular aza-Michael addition of alkyl amines to α,β-unsaturatedcarboxylicacid has been realized. The corresponding pyrrolidine and piperidine derivatives can be obtained in good to excellent yields. Reaction using chiral NHC catalyst showed promising enantioselectivities up to 55% ee. Further chemical transformations of the products provided carboxylicacids, alcohols, and unprotected
N-杂环卡宾催化烷基胺与α,β-不饱和羧酸的分子内氮杂-迈克尔加成反应已经实现。相应的吡咯烷和哌啶衍生物可以以良好到极好的收率获得。使用手性 NHC 催化剂的反应显示出高达 55% ee 的对映选择性。产物的进一步化学转化提供了羧酸、醇和未保护的胺。
[EN] BRIDGED BI-AROMATIC CATALYSTS, COMPLEXES, AND METHOD OF USING THE SAME<br/>[FR] CATALYSEURS BI-AROMATIQUES PONTES, COMPLEXES, ET PROCEDE D'UTILISATION DE CEUX-CI
申请人:SYMYX TECNOLOGIES INC
公开号:WO2005108406A1
公开(公告)日:2005-11-17
Ligands, compositions, metal-ligand complexes and arrays with substituted bridged bis-biaromatic ligands and method of making and using the same, are disclosed that are useful in the catalysis of transformations such as the polymerization of monomers into polymers. The catalyts have high performance characteristics, including higher comonomer incorporation into ethylene/olefin copolymers, where such olefins are for exmaple, 1-octene, propylene or styrene. The catalysts also polymerize propylene into isotactic polypropylene.