Palladium-Catalyzed C(sp<sup>3</sup>)–H Nitrooxylation with <i>tert</i>-Butyl Nitrite and Molecular Oxygen
作者:Bo Li、Ye-Qiang Han、Xu Yang、Bing-Feng Shi
DOI:10.1021/acs.orglett.0c03794
日期:2020.12.18
Herein, we report a Pd(II)-catalyzed nitrooxylation of unactivated methyl C(sp3)–H bonds using commercial available and easily manageable tert-butyl nitrite as the precursor of ONO2 radical under aerobic conditions. Environmentally benign molecularoxygen is used to initiate the generation of active radical reactant; it is also used as the terminal oxidant. A broad range of nitrooxylated aliphatic
IDENTIFICATION OF COMPOUNDS MODIFYING A CELLULAR RESPONSE
申请人:Thastrup Ole
公开号:US20130123140A1
公开(公告)日:2013-05-16
The present invention relates to methods for identifying compounds capable of modulating a cellular response. The methods involve attaching living cells to solid supports comprising a library of test compounds. The test compounds are linked to the solid support via cleavable linkers and may thus be released from the solid supports. Solid supports comprising cells, wherein the cellular response of interest has been modulated are selected and the test compound of the solid support can then be identified. The cellular response may for example be changes in complex formation between proteins.
CYCLIC PEPTIDE COMPOUND HAVING HIGH MEMBRANE PERMEABILITY, AND LIBRARY CONTAINING SAME
申请人:Chugai Seiyaku Kabushiki Kaisha
公开号:EP3636807A1
公开(公告)日:2020-04-15
The present inventors have found that when screening for cyclic peptide compounds that can specifically bind to a target molecule, the use of a library including cyclic peptide compounds having a long side chain in the cyclic portion can improve the hit rate for cyclic peptide compounds that can specifically bind to the target molecule. Meanwhile, the present inventors have found that tryptophan and tyrosine residues, which have conventionally been used in oral low molecular-weight pharmaceuticals and are amino acid residues having an indole skeleton or a hydroxyphenyl group, are not suitable for peptides intended to attain high membrane permeability.
SYNTHESIS AND APPLICATION OF OXASPIROCYCLODIPHOSPHINE LIGAND
申请人:SHENZHEN CATALYS TECHNOLOGY CO., LTD.
公开号:EP3730502A1
公开(公告)日:2020-10-28
The present invention relates to the technical field of chiral synthesis, and specifically provides the synthesis and use of a new type of oxa-spirodiphosphine ligands. The bisphosphine ligand is prepared with oxa-spirobisphenol as a starting material after triflation, palladium catalyzed coupling with diaryl phosphine oxide, reduction of trichlorosilane, further palladium catalyzed coupling with diaryl phosphine oxide, and further reduction of trichlorosilane. The oxa-spiro compound has central chirality, and thus includes L-oxa-spirodiphosphine ligand and R-oxa-spirodiphosphine ligand. The racemic spirodiphosphine ligand is capable of being synthesized from racemic oxa-spirobisphenol as a raw material. The present invention can be used as a chiral ligand in the asymmetric hydrogenation of unsaturated carboxylic acids. The complex of the ligand with ruthenium can achieve an enantioselectivity of greater than 99% in the asymmetric hydrogenation of methyl-cinnamic acid.
[EN] SYNTHESIS AND APPLICATION OF OXASPIROCYCLODIPHOSPHINE LIGAND<br/>[FR] SYNTHÈSE ET APPLICATION D'UN LIGAND OXASPIROCYCLODIPHOSPHINE<br/>[ZH] 氧杂螺环双膦配体的合成与应用