fluorescent probe based on boron-dipyrromethene dye (BODIPY) for lateendosomestaining in livecells. Among the 14 pH-responsive BODIPY-based far-red/near-infrared dyes used, it was found that a (4-methyl-1-piperazinyl)phenyl-substituted BODIPY could stainlateendosomes in three different cell lines. This BODIPY dye was applicable for measurement of the fusion time of lateendosomes and lysosomes
[Ph
<sub>4</sub>
P]
<sup>+</sup>
[Cu(CF
<sub>2</sub>
H)
<sub>2</sub>
]
<sup>−</sup>
: A Powerful Difluoromethylating Reagent Inspired by Mechanistic Investigation
作者:Haiwei Zhao、Xuebing B. Leng、Wei Zhang、Qilong Shen
DOI:10.1002/anie.202210151
日期:2022.10.17
A powerful difluoromethylating reagent [Ph4P]+[Cu(CF2H)2]− that was able to difluoromethylate a variety of aryl and alkyl electrophiles was developed. In the presence of an oxidant, complex 2 also reacted with various lithium nbutyl arylboronic acid pinacol esters, alkyne and heteroarene. Moreover, complex 2 could transmetalate the difluoromethyl reagent to other metals such as [Ph4P]+[Cu(Cl2)]− and
Kinetic Resolution of Secondary Alcohols Catalyzed at the Exterior of Chiral Coordinated Capsules
作者:Kentaro Harada、Ryo Sekiya、Takeharu Haino
DOI:10.1002/chem.202304244
日期:2024.2.21
The confinement of the chiral space inside a molecular host is an ideal platform for enantioselective reactions. However, this concept significantly limits the scope of reactants because reactants must be trapped inside molecular hosts. Instead, we utilized the exteriors of chiral molecular capsules as chiral sources and realized the kineticresolution of secondary alcohols.
A dearomative allylation of naphthyl cyanohydrins with allyl borates and allyl stannanes under palladium catalysis was developed. At the initial stage of this study, the dearomative reaction (C4 substitution of the aromatics) was competing with benzyl substitution. To circumvent this issue, the use of palladium and meta-disubstituted triarylphosphine as the catalyst in a 1:1 ratio was found to enhance the site selectivity, furnishing the desired dearomatized products. Further derivatizations of products were also successful.
Photochromism of a Radical Diffusion-Inhibited Hexaarylbiimidazole Derivative with Intense Coloration and Fast Decoloration Performance
We report the synthesis and the photochromic behavior of a newly designed, photochromic, radical diffusion-inhibited hexaarylbiimidazole (HABI) derivative with markedly improved photochromic performance in coloration and decoloration rates as well as greater optical density in the colored state. The thermal bleaching rate (tau(1/2) = 260 ms at 295 K) is the fastest among the reported ones for HABI derivatives.