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Ramazani, Ali,Nasrabadi, Fatemeh Zeinali,Karimi, Zahra,Rouhani, Morteza Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.8
The 1:1 imine intermediate generated by the addition of primary amine to chloroacetone is trapped by N-isocyaniminotriphenylphosphorane in the presence of (E)-cinnamic acids and the corresponding iminophosphorane intermediate was formed. Disubstituted 1,3,4-oxadiazole derivatives are formed via intramolecular aza-Wittig reaction of the iminophosphorane intermediate. The reactions were completed in neutral conditions at room temperature. The disubstituted 1,3,4-oxadiazole derivatives were produced in excellent yields.
Ramazani, Ali,Nasrabadi, Fatemeh Zeinali,Abdian, Behnaz,Rouhani, Morteza Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.2
Reactions of (N-isocyanimino)triphenylphosphorane with (1R)-(-)-campherchinon in the presence of aromatic carboxylic acids proceed smoothly at room temperature and in neutral conditions to afford sterically congested 1,3,4-oxadiazole derivatives in high yields. The reaction proceeds smoothly and cleanly under mild conditions and no side reactions were observed.
Ali Ramazani,Behnaz Abdian,Fatemeh Zeinali Nasrabadi,Nahid Shajari,Zahra Ranjdoost 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
A simple method has been developed for four-component synthesis of disubstituted 1,3,4-oxadiazoles using (N-isocyanimino)triphenylphosphorane, a primary amine, a carboxylic acid and biacetyl in CH2Cl2 by the Ugi- 4CR/aza-Wittig sequence at room temperature in excellent yields.
Ali Ramazani,Fatemeh Zeinali Nasrabadi,Zahra Karimi,Morteza Rouhani 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.8
The 1:1 imine intermediate generated by the addition of primary amine to chloroacetone is trapped by Nisocyaniminotriphenylphosphorane in the presence of (E)-cinnamic acids and the corresponding iminophosphorane intermediate was formed. Disubstituted 1,3,4-oxadiazole derivatives are formed via intramolecular aza-Wittig reaction of the iminophosphorane intermediate. The reactions were completed in neutral conditions at room temperature. The disubstituted 1,3,4-oxadiazole derivatives were produced in excellent yields.
Ramazani, Ali,Nasrabadi, Fatemeh Zeinali,Ahankar, Hamideh,Asiabi, Pegah Azimzadeh,Sadri, Fariba,Joo, Sang Woo Taylor Francis 2016 Phosphorus, sulfur, and silicon and the related el Vol.191 No.2
<P>Reactions of N-isocyaniminotriphenylphosphorane (NICITPP) with 2-oxopropyl-1-benzenecarbothioate in the presence of aromatic carboxylic acids and primary amines proceed smoothly at room temperature (18-26 degrees C) and in neutral conditions to afford sterically congested 1,3,4-oxadiazole derivatives in high yields. The reaction progresses smoothly and clearly under mild conditions and no side reactions were observed.</P>
Ramazani, Ali,Abdian, Behnaz,Nasrabadi, Fatemeh Zeinali,Shajari, Nahid,Ranjdoost, Zahra Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
A simple method has been developed for four-component synthesis of disubstituted 1,3,4-oxadiazoles using (N-isocyanimino)triphenylphosphorane, a primary amine, a carboxylic acid and biacetyl in $CH_2Cl_2$ by the Ugi-4CR/aza-Wittig sequence at room temperature in excellent yields.
Ali Ramazani,Fatemeh Zeinali Nasrabadi,Behnaz Abdian,Morteza Rouhani 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.2
Reactions of (N-isocyanimino)triphenylphosphorane with (1R)-(.)-campherchinon in the presence of aromatic carboxylic acids proceed smoothly at room temperature and in neutral conditions to afford sterically congested 1,3,4-oxadiazole derivatives in high yields. The reaction proceeds smoothly and cleanly under mild conditions and no side reactions were observed.
Ramazani, Ali,Ahmadi, Yavar,Fattahi, Nadia,Ahankar, Hamideh,Pakzad, Mousa,Aghahosseini, Hamideh,Rezaei, Aram,Fardood, Saeid Taghavi,Joo, Sang Woo Informa UK (TaylorFrancis) 2016 Phosphorus, sulfur, and silicon and the related el Vol.191 No.7
<P>The 1:1 imine intermediate generated by the addition of a primary amine to cyclohexanone trapped by N-isocyaniminotriphenylphosphorane (NICITPP) in the presence of aromatic carboxylic acids and the corresponding iminophosphorane intermediate was formed. Disubstituted 1,3,4-oxadiazole derivatives are formed via intramolecular aza-Wittig reaction of the iminophosphorane intermediate. The reactions were completed in neutral conditions at room temperature (18-26 degrees C). The disubstituted 1,3,4-oxadiazole derivatives were produced in excellent yields. [GRAPHICS]</P>