efficient one‐pot synthesis of S‐perfluoroalkylated NH‐sulfoximines from sulfides has been developed using phenyliodine diacetate (PIDA) and ammonium carbamate. Remarkable rate enhancement with trifluoroethanol was observed, presumably due to H‐bonding effects. These mild and metal‐free conditions are compatible with ‐CH2F, ‐CFCl2, ‐CF2H, ‐CF2Br, ‐C4F9, and ‐CF3 groups, in both the alkyl‐ and aryl series. Based
使用二碘苯基碘二乙酸酯(PIDA)和氨基甲酸铵开发了一种通用的由硫化物有效地单锅合成S-全氟烷基化NH-亚磺酰亚胺的方法。观察到三氟乙醇显着提高了速率,这可能是由于氢键作用所致。这些温和且无金属的条件在烷基和芳基系列中均与-CH 2 F,-CFCl 2,-CF 2 H,-CF 2 Br,-C 4 F 9和-CF 3基团兼容。根据19 F NMR分析,λ 6,提出了-acetoxysulfanenitrile中间体。
Synthesis of Amino Acids Bearing Halodifluoromethyl Moieties and Their Application to p53-Derived Peptides Binding to Mdm2/Mdm4
作者:Sebastian Vaas、Markus O Zimmermann、Theresa Klett、Frank M Boeckler
DOI:10.2147/dddt.s406703
日期:——
backbone, and incorporation of unnatural amino acids. One approach previously established, is the use of halogenated aromatic amino acids. In principle, they are thereby enabled to form halogen bonds (XB). In this study, we focus on the -R-CF2X moiety (R = O, NHCO; X = Cl, Br) as an uncommon halogenbonddonor. These groups enable more spatial variability in protein–protein interactions. The chosen approach
a visible-light-induced iridium-promoted direct bifunctionalization of 3-butenoicacid with bromodifluoromethyl heteroarylsulfones. This methodology enables the concurrent introduction of difluoromethyl heteroarylsulfone and bromine groups into 3-butenoicacid under mild reaction conditions. Various α-substituted 3-butenoicacids and bromodifluoromethyl heteroarylsulfones were found to be compatible
diastereoselective synthesis of quaternary-carbon-containing fluoroalkylcyclobutanes is realized by photocatalytic 4-exo-trig cyclization cascade of thioalkynes or trifluoromethylalkenes. DFT calculations suggest that a fluorine effect, resulting from hyperconjugative π→σ*C-F interactions, accounts for the α-selective radical addition at the stericallyhindered alkene carbon, which facilitates the uncommon
bromine-magnesium exchange reactions of arylthiobromodifluoromethanes with Grignardreagents have been studied. Upon trapping with electrophiles, alkyl aryl sulfides and ketenedithioacetals are obtained. The reaction is proposed to occur vianovel alpha-arylsulfanyl-alpha-fluoro carbenoids. The first examples of arylthiomethane multipole synthons are also reported. [reaction: see text]