Asymmetric α-Amination Reaction of Alkenoate Cyclic Esters Catalyzed by Chiral Tin Alkoxides
作者:Akira Yanagisawa、Yoshiki Yamashita、Chika Uchiyama、Ryuta Nakano、Moe Horiguchi、Kazuki Ida
DOI:10.1055/s-0037-1612278
日期:2019.4
α-amination reaction of alkenoate cyclic esters with dialkyl azodicarboxylates was achieved by using a 3,3′-di(1-naphthyl)-substituted (R)-BINOL–dibromostannane complex as a chiral precatalyst in the presence of a sodium alkoxide and an alcohol. Optically active α-hydrazino ketones were obtained in moderate to high yields and with up to 91% ee in the presence of the chiral tin alkoxide generated in
LITHOGRAPHIC PRINTING PLATE HAVING HIGH CHEMICAL RESISTANCE
申请人:Kodak Polychrome Graphics Company Ltd.
公开号:EP1268660A1
公开(公告)日:2003-01-02
[EN] LITHOGRAPHIC PRINTING PLATE HAVING HIGH CHEMICAL RESISTANCE<br/>[FR] PLANCHE D'IMPRESSION LITHOGRAPHIQUE TRES RESISTANTE AUX AGENTS CHIMIQUES
申请人:KODAK POLYCHROME GRAPHICS CO
公开号:WO2001046318A1
公开(公告)日:2001-06-28
Imageable elements useful as lithographic printing members are disclosed. The elements contain a substrate, an underlayer, and a top layer. The underlayer contains a combination of two polymeric materials that provides resistance both to fountain solution and to aggressive washes, such as a UV wash. The underlayer can be used in either thermally imageable or photochemically imageable elements. Preferably the first polymeric material is a copolymer that comprises an N-substituted maleimide, methacrylamide, and methacrylic acid; and the second polymeric material is either (1) a copolymer that contains a pendent urea group, (2) a copolymer that contains a pendent sulfonamide group, or (3) a combination thereof. Also claimed is a chemical composition comprising the two above mentioned polymers.