Dihalogen and Solvent-Free Preparation of syn-Bimane
作者:Flavio Grynszpan、Ishita Neogi、Partha Das
DOI:10.1055/s-0036-1591964
日期:2018.5
widespread use of these molecular probes has presumably been stalled by the hazards involved in their current synthetic preparation which involve handling of dangerous halogens like chlorine (gas) and bromine (liq.). The accessibility achieved by the simple and safe dihalogen and solvent-free methodologies described here open the floodgates to additional future practical applications of bimanes.
Considering that the pH in the tumor microenvironment is dysregulated, we designed a β-hairpinpeptide (SSRFEWEFESSDPRGDPSSRFEWEFESS). The configuration of the peptide switched from a flexible linear to a rigid loop structure under weakly acidic conditions. The peptide internalized by tumor cells increased significantly under weakly acidic conditions.
考虑到肿瘤微环境中的pH值失调,我们设计了一种β-发夹肽(SSRFEWEFESS D PRGDPSSRFEWEFESS)。在弱酸性条件下,肽的构型从柔性线性转变为刚性环结构。在弱酸性条件下,被肿瘤细胞内化的肽显着增加。
Tautomerism-Dependent Ring Construction of <i>N</i>-Heterocyclic Compounds from the Reactions of 1-Alkynyl Fischer Carbene Complexes and Substituted Pyrazolinones
作者:Zheng、Yu、Ning Luo、Xiuwen Han
DOI:10.1021/jo061725+
日期:2006.12.1
from the reactions of 1-alkynyl Fischer carbene complexes (OC)5MC(OEt)C⋮CPh (1) (M = Cr, W) and substituted pyrazolinones (2). Reactions of 1 with 3-methyl-2-pyrazolin-5-one (2a), 3-n-propyl-2-pyrazolin-5-one (2b), 3,4-dimethyl-2-pyrazolin-5-one (2c), 3,4-trimethylene-2-pyrazolin-5-one (2d), or 3,4-tetramethylene-2-pyrazolin-5-one (2e) generated three kinds of Fischer aminocarbene complexes (3−5), and
作者:Daryl A. Guthrie、Anthony Ho、Cyrus G. Takahashi、Anthony Collins、Matthew Morris、John P. Toscano
DOI:10.1021/jo502330w
日期:2015.2.6
A new and versatile class of HNO donors, the (hydroxylamino)pyrazolone (HAPY) series of HNO donors utilizing pyrazolone (PY) leaving groups, is described. HNO, the smallest N-based aldehyde equivalent, is used as a reagent along with a variety of PY compounds to synthesize the desired HAPY donors in what can be considered an N-selective HNO-aldol reaction in up to quantitative yields. The bimolecular
描述了一种新型的多功能HNO供体,即利用吡唑啉酮(PY)离开基团的HNO供体的(羟胺基)吡唑啉酮(HAPY)系列。HNO(最小的N基醛当量)与各种PY化合物一起用作试剂,可以合成N-选择性HNO-醛醇缩合反应中所需的HAPY供体,且定量产率最高。在37°C的pH 7.4磷酸盐缓冲液中,HNO与PY的双分子速率常数可以达到8×10 5 M –1 s –1。在1在核磁共振实验中,HAPY化合物在生理学相关条件下定量生成HNO(以膦氮杂氮膦形式捕获),半衰期跨度为3个数量级(数分钟至数天)。B3LYP / 6-31G *计算证实了HNO与PY烯醇和烯醇化物之间在能量上有利的反应,而HNO的释放预计会通过每种HAPY化合物的氧阴离子(O HN-PY)发生。HNO已被证明可以为心脏衰竭提供功能支持。
Highly sensitive detection of cobalt through fluorescence changes in β-cyclodextrin-bimane complexes