Carbohydrate-Based Receptors with Multiple Thiourea Binding Sites. Multipoint Hydrogen Bond Recognition of Dicarboxylates and Monosaccharides
摘要:
The binding properties of multitopic sugar thiourea receptors toward dicarboxylate and monosaccharide guests have been examined taking glutarate and octyl P-D-glucopyranoside as model ligands. For the anionic hydrogen bond acceptor, both the complex stoichiometry and the association constants (K-as) were found to be strongly dependent on the relative disposition of recognition elements in the host. In contrast, for the glucoside guest a 1:1 stoichiometry was observed in all cases, the K-as values being largely independent of the unbound state provided that geometrically equivalent supramolecular topologies can be achieved.
NSCLC Structure-activity Relationship (SAR) Study of Diisothiocyanates for Antiproliferative Activity on A549 Human Non-small Cell Lung Carcinoma (NSCLC)
Macrocycliccompounds 5a-i bearing two tetraazathiapentalene frameworks were synthesized by the reaction of 10-S-3 tetraazathiapentalene derivatives 3a-f with compounds having various diisothiocyanate functions 4a-e. The reduction of the macrocycliccompounds with NaBH4 afforded the ring-opened macrocycliccompounds 11a-b and 11e-h by elimination of the hypervalent sulfur. The structures of these compounds
通过使10-S-3四氮杂并戊戊烯衍生物3a-f与具有各种二异硫氰酸酯官能团的化合物4a-e反应,合成带有两个四氮杂并戊戊烯骨架的大环化合物5a-i 。用NaBH 4还原大环化合物通过消除高价硫而得到开环的大环化合物11a-b和11e-h。这些化合物的结构通过其光谱数据以及IIa的X射线晶体学分析来建立。带有四个硫脲基团的其他开环大环化合物14a和14e-h是通过碱水解在图5a和5e-h中的区别在于发生了四氮杂戊戊烯环中C = S IV部分的消除。
Internal release agent, composition including internal release agent, and process for producing a plastic lens using same composition
申请人:MITSUI CHEMICALS, INC.
公开号:US10239239B2
公开(公告)日:2019-03-26
An internal release agent includes at least one phosphodiester represented by the following general formula (1).
In the formula, R1 and R2 independently represent a hydrocarbon group having 1 to 30 carbon atoms, which is optionally substituted with at least one hydroxyl group, and R3 represents an alkylene group having 2 to 4 carbon atoms. A plurality of R3's may be the same as or different from each other. M represents a hydrogen atom, an ammonium ion, an alkali metal ion, or a monovalent/divalent alkali earth metal ion, and n is an integer of 1 to 60.
Discovery of human hexosaminidase inhibitors by in situ screening of a library of mono- and divalent pyrrolidine iminosugars
作者:Valeria Pingitore、Macarena Martínez-Bailén、Ana T. Carmona、Zuzana Mészáros、Natalia Kulik、Kristýna Slámová、Vladimír Křen、Pavla Bojarová、Inmaculada Robina、Antonio J. Moreno-Vargas
DOI:10.1016/j.bioorg.2022.105650
日期:2022.3
e from Jack beans, the plant ortholog of human lysosomal hexosaminidases. A selection of the best inhibitors of these libraries was then evaluated against human lysosomal β-N-acetylhexosaminidase B (hHexB) and human nucleocytoplasmic β-N-acetylglucosaminidase (hOGA). This evaluation identified a potent (nM) and selective monomeric inhibitor of hOGA (compound 7A) that showed a 6890-fold higher affinity
Synthesis of enantioenriched azo compounds: organocatalytic Michael addition of formaldehyde N-tert-butyl hydrazone to nitroalkenes
作者:David Monge、Silvia Daza、Pablo Bernal、Rosario Fernández、José M. Lassaletta
DOI:10.1039/c2ob26963e
日期:——
moderate enantioselectivities, up to 84 : 16 er; additional transformation of diazenes into their tautomeric hydrazones proved to be operationally simple and high-yielding, affording bifunctional compounds which represent useful intermediates for the synthesis of enantioenriched β-nitro-nitriles and derivatives thereof.