Catalytic Synthesis of N-Heterocycles via Direct C(sp<sup>3</sup>)–H Amination Using an Air-Stable Iron(III) Species with a Redox-Active Ligand
作者:Bidraha Bagh、Daniël L. J. Broere、Vivek Sinha、Petrus F. Kuijpers、Nicolaas P. van Leest、Bas de Bruin、Serhiy Demeshko、Maxime A. Siegler、Jarl Ivar van der Vlugt
DOI:10.1021/jacs.7b00270
日期:2017.4.12
challenging intramolecular direct C(sp3)–H amination of unactivated organic azides to generate a range of saturated N-heterocycles with the highest turnover number (TON) (1 mol% of 1, 12 h, TON = 62; 0.1 mol% of 1, 7 days, TON = 620) reported to date. The catalyst is easily recycled without noticeable loss of catalytic activity. A detailed kinetic study for C(sp3)–H amination of 1-azido-4-phenylbutane (S1) revealed
A depsipeptide containing a non-natural amino acid(s) having the formula (1)
wherein R1 represents a C5-C20 alkyl group and others; R2 represents —O—CO—CH(R5)—X—CH(R6)—NH— (wherein X represents N(R7)—CO, CH2—CO, CH2—CH2 and others, R5, R6, and R7 represent a hydrogen atom or a C1-C6 alkyl group); R3 represents
and wherein the remaining substituent variables are as defined herein.
The above depsipeptides have a promoting activity on the production of apolipoprotein E, and are useful as a therapeutic agent for neurologic damages, especially dementia, and hyperlipemia.
There is disclosed probes bearing partial metal chelators that in some embodiments are conformationally constrained. In certain embodiments such probes are useful in methods for the detection of a specific target molecule. These target molecules may include oligonucleotides, peptides, proteins, polysaccharides, or small molecules. There is further disclosed the use of probes with partial metal chelators engaged in a coordination complex with one another that imposes a structural constraint in the probe and increases the specificity factor of the probe.
FUCOSE DERIVATIVES, DRUGS CONTAINING THE SAME AS ACTIVE INGREDIENT, AND INTERMEDIATES FOR PRODUCING THE SAME
申请人:KANEBO, LTD.
公开号:EP0859005A1
公开(公告)日:1998-08-19
A compound of the formula (I):
wherein X1 is a group of one of the following formulae (1), (2) and (3):
R1 is a branched long chain alkyl group, R2 is ―CONHR3, a carboxyl group or a hydrogen atom, n is an integer of 0, 1 or 2, and R3 is a lower alkyl group or a phenyl group, or a pharmaceutically acceptable salt thereof, which is useful as a selectin inhibitor, and can be used in the prophylaxis or treatment of various inflammatory diseases such as inflammatory dermatitis (e.g., atopic dermatitis, contact hypersensitivity, photodermatosis, etc.), autoimmune chronic diseases (e.g. rheumatoid arthritis, chronic thyroiditis, etc.), and ischemia-reperfusion injury.