Electrochemical Cyanation of Alcohols Enabled by an Iodide-Mediated Phosphine P(V/III) Redox Couple
作者:Xuewen Guo、Nathan G. Price、Qilei Zhu
DOI:10.1021/acs.orglett.4c02550
日期:2024.9.6
We report herein a mild electrochemical method to transform alcohols into their corresponding nitriles by using commercially available reagents. This protocol accepts substrates with various functional groups including those that are susceptible to oxidative decomposition. Mechanistic studies revealed a critical iodide-mediated phosphine electrochemicaloxidation pathway leading to the alkoxyphosphonium
TRICYCLIC PYRROLOPYRIDINE COMPOUND, AND JAK INHIBITOR
申请人:Nissan Chemical Corporation
公开号:EP2955181B1
公开(公告)日:2019-10-30
Nickel-Catalyzed Cross-Coupling between Functionalized Primary or Secondary Alkylzinc Halides and Primary Alkyl Halides
作者:Anne Eeg Jensen、Paul Knochel
DOI:10.1021/jo0105787
日期:2002.1.1
In the presence of Bu4NI (3 equiv) and 4-fluorostyrene (20 mol %), unreactive primary and secondary alkylzinc iodides undergo nickel-catalyzed cross-couplings with various primary alkyl iodides or bromides. More reactive secondary dialkylzincs and the mixed zinc organometallics RZnTMSM undergo the cross-coupling reaction in the absence of Bu4NI. The bicyclic secondary diorganozinc 6 prepared via boron-zinc exchange reacts with high retention of configuration. Free NH-groups are tolerated in the cross-coupling allowing the synthesis of aminated products.
2-Substituted histamines with G-protein-stimulatory activity
作者:H Detert、A Hagelüken、R Seifert、W Schunack
DOI:10.1016/0223-5234(96)88235-3
日期:1995.1
The cationic-amphiphilic 2-substituted histamines, 2-(3-chlorophenyl)histamine (2-[2-(3-chlorophenyl)-1H-imidazol-4-yl]ethanamine) and 2-(2-cyclohexylethyl)histamine, activate pertussis toxin-sensitive guanine nucleotide-binding proteins (G-proteins) of the G(i)-subfamily by a receptor-independent mechanism. We studied structure-activity relationships of 2-substituted histamine derivatives for this G-protein activation using six known and 12 newly synthesized compounds. Elongation of the alkyl chain between imidazole and the ring system enhanced the potency and efficiency of substances in activating high-affinity GTP hydrolysis, ie the enzymatic activity of G-protein alpha-subunits, in membranes of HL-60 leukemic cells. Cyclopentyl-, cyclohexyl- and norbornyl-substituted histamines were more effective and potent than phenyl-substituted histamines in mediating G-protein activation in HL-60 membranes and in activating reconstituted bovine brain G(i)/G(o)-proteins. Our data show that the chain length and the type of ring system are important determinants for receptor-independent G-protein activation by 2-substituted histamines. With respect to histamine H-1-receptors, most of the substances studied displayed weak antagonistic activity.