A catalytic enantioselective synthetic strategy for the aryl-substituted all-carbon quaternary stereocenters of bioactive hydrodibenzofuran alkaloids was achieved by the Michael addition reaction of α-cyano ketones and acrylates using a chiral tertiary amine–thiourea catalyst. This method can tolerate steric bulkiness and multiple functional groups, and 32 Michael adducts were prepared in good to excellent
Enantioselective synthesis of γ-tetrasubstituted nitrosulfonyl carboxylates and amides via<scp>l</scp>-tert-leucine-derived-squaramide catalyzed conjugate addition of nitrosulfones to acrylates and acrylamides
作者:Kalisankar Bera、Irishi N. N. Namboothiri
DOI:10.1039/c4ob00344f
日期:——
Michael addition of α-nitrosulfones to aryl- and alkyl acrylates and acrylamides proceeds in the presence of 5–10 mol% of an amino acid derived new organocatalyst to provide γ-tetrasubstituted γ-nitro-γ-sulfonyl carboxylates and amides in excellent yields and enantioselectivities. Scale-up of the reaction to multi-grams, convenient recovery of the catalyst and its recyclability without any drop in
[EN] FUROXANS AS THERAPIES FOR NEURODEGENERATIVE DISORDERS<br/>[FR] FUROXANES UTILISÉS EN TANT QUE THÉRAPIES POUR DES TROUBLES NEURODÉGÉNÉRATIFS
申请人:UNIV TOLEDO
公开号:WO2018093762A1
公开(公告)日:2018-05-24
Furoxan compounds, compositions comprising the same, and methods of making and using the same, are described.
Furoxan化合物、包含该化合物的组合物以及制备和使用该化合物的方法被描述。
The use of a particulate polymer as a carrier for biological substances and the like and such substances supported on the carrier
申请人:JAPAN SYNTHETIC RUBBER CO., LTD.
公开号:EP0095932A1
公开(公告)日:1983-12-07
A carrier particularly suitable for supporting biological substances is composed of a particulate polymer prepared by polymerizing at least one monomer of formula:
(in which R1 and R2 are the same or different and each represents a hydrogen atom or an alkyl group, R3 represents a straight or branched chain alkylene group optionally having a hydroxy substituent, X represents a halogen atom, m is 0 or an integer from 1 to 10 and n is an integer from 1 to 5) optionally in admixture with at least one other copolymerizable monomer. Biological substances which may be supported by the carrier include immunoreactive substances, enzymes, cells and cell-discriminating substances.
Resin material for plastic lens and lens composed thereof
申请人:TORAY INDUSTRIES, INC.
公开号:EP0134861A1
公开(公告)日:1985-03-27
A polymer having a high refractive index is obtained by polymerizing a urethanized acrylic or methacrylic monomer obtained by reacting the hydroxyl group of an acrylic or methacrylic monomer having a nucleus-halogen-substituted aromatic ring and a hydroxyl group with the isocyanate group of a polyfunctional isocyanate. This polymer is valuable as a resin material for a plastic lens.