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Piperazine is freely soluble in water and ethylene glycol, but insoluble in diethyl ether. It is a weak base with two pK b of 5.35 and 9.73 at 25 °C.; the pH of a 10% aqueous solution of piperazine is 10.8–11.8. Piperazine readily absorbs water and carbon dioxide from the air.
1-(2-Pyrimidinyl)piperazine (1-PP, 1-PmP) is a chemical compound and piperazine derivative. It is known to act as an antagonist of the α 2 -adrenergic receptor (K i = 7.3–40 nM) [ 1 ] and, to a much lesser extent, as a partial agonist of the 5-HT 1A receptor (K i = 414 nM; E max = 54%).
One-pot synthesis of N-substituted 2,5-DKPs via indolamide The mild acidic and chemoselective post Ugi activation of 5 involving simultaneous indolamide formation and tert-butoxycarbonyl (Boc) removal gives the active amide 6 which allows cyclization to 7 without affecting other peptidic or even ester moieties and with stereochemical retention ...
N-Methylpiperazine is a common building block used in organic synthesis. [2] For example, N-methylpiperazine is used in the manufacture of various pharmaceutical drugs including cyclizine, [3] meclizine, and sildenafil. The lithium salt, lithium N-methylpiperazide, is used as a reagent in organic synthesis for protection of aryl aldehydes. [4]
It is both a precursor in the synthesis of aripiprazole and one of its metabolites. [1] [2] It is unclear whether 2,3-DCPP is pharmacologically active as a serotonin receptor agonist similar to its close analogue 3-chlorophenylpiperazine (mCPP), though it has been shown to act as a partial agonist of the dopamine D 2 and D 3 receptors. [3]
In the Staedel–Rugheimer pyrazine synthesis (1876), 2-chloroacetophenone is reacted with ammonia to the amino ketone, then condensed and then oxidized to a pyrazine. [5] A variation is the Gutknecht pyrazine synthesis (1879) also based on this selfcondensation , but differing in the way the alpha-ketoamine is synthesised.
1-(2-Pyridinyl)piperazine is a chemical compound and piperazine derivative. Some derivatives of this substance are known to act as potent and selective α 2-adrenergic receptor antagonists, such as 1-(3-fluoro-2-pyridinyl)piperazine. [1] A few pyridinylpiperazine derivatives are drugs, including: Azaperone — antipsychotic; Atevirdine ...
Vanoxerine is a piperazine with two different alkyl sidechains attached. Its synthesis uses a tert-butyloxycarbonyl protecting group (Boc group) to mask the reactivity of one of its nitrogen atoms while the other is alkylated.