21031-22-1Relevant academic research and scientific papers
P2X3 RECEPTOR ANTAGONISTS FOR TREATMENT OF PAIN
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Page/Page column 54, (2010/11/18)
The subject invention relates to novel P2X3 receptor antagonists that play a critical role in treating disease states associated with pain, in particular peripheral pain, inflammatory pain, or tissue injury pain that can be treated using a P2X
Aminomethylene ketones and enamines in heterocyclic synthesis: Synthesis of functionally substituted pyridine, pyrazole, fused pyrimidine and fused [1,5]diazocine derivatives
Hassanien, Abu Zeid A.,Mohamed, Mona H.,Gohzlan, Said A.S.
, p. 440 - 445 (2007/10/03)
Methyl 2-benzoyl-3-dimethylaminopropenoate (2) and 2-(benzimidazo-2-yl)-3- dimethylaminoacrylonitrile (27) were condensed with various type of reagents under different conditions to afford new acyclic, cyclic and fused heterocyclic derivatives.
Two-step Synthesis of Imidazoles from Activated Alkynes
Casey, Michael,Moody, Christopher J.,Rees, Charles W.,Young, Richard G.
, p. 741 - 746 (2007/10/02)
Conjugate addition of 2-(tri-n-butylstannyl)tetrazoles (1) to activated alkynes gives 1-alkenyltetrazoles (4) and (5) predominantly.Use of the N-tributylstannyl derivatives, rather than the parent tetrazole, gives a high ratio of 1- to 2-alkenyl isomers and avoids the complication of further addition of the tetrazole or the alkyne to the initial adduct.Irradiation of the (Z)- and (E)-1-alkenyltetrazoles (4) and (5) at 254 nm then gives the expected imidazoles in moderate yield.However, 5-phenyl-2-(tri-n-butylstannyl)tetrazole (1a) reacted only slowly with ethyl phenylpropiolate to give ethyl 3,5-diphenylpyrazole-4-carboxylate (8), presumably via the 2-alkenyltetrazole (9) formed in preference to the 1-isomer for steric reasons.
Studies on Organic Fluorine Compounds. XLII. Synthesis and Reactions of Phenyltrifluoromethylacetylenes
Kobayashi, Yoshiro,Yamashita, Toshinori,Takahashi, Katsuhiro,Kuroda, Hisashi,Kumadaki, Itsumaro
, p. 4402 - 4409 (2007/10/02)
Phenyltrifluoromethylacetylene (4a) was synthesized by the pyrolysis of triphenylphosphonium α-(trifluoroacetyl)benzylide (3a), which was easily derived from benzyl halide (1a).This method can be used for the synthesis of 4-substituted-phenyltrifluoromethylacetylenes (4).The 1,3-dipolar reaction of 4 with diazomethane and phenyl azide proceeds readily to give trifluoromethylated pyrazoles and triazoles.Keywords - trifluoromethyl; acetylene; 1,3-dipolar reaction; intramolecular Wittig reaction; trifluoroacetylphosphonium ylide; pyrazole; diazomethane; phenyl azide
