New pyrazolium-carboxylates as structural analogues of the pseudo-cross-conjugated betainic alkaloid Nigellicine

A Schmidt, T Habeck, MK Kindermann…

Index: Schmidt, Andreas; Habeck, Tobias; Kindermann, Markus Karl; Nieger, Martin Journal of Organic Chemistry, 2003 , vol. 68, # 15 p. 5977 - 5982

Full Text: HTML

Citation Number: 55

Abstract

Pyrazolium-3-carboxylates were examined as relatives of the betainic alkaloid Nigellicine and as new examples of the sparsely populated class 16 of heterocyclic pseudo-cross- conjugated mesomeric betaines (PCCMB). The title compounds were prepared in a 4-step procedure starting from β-diketo compounds 8 which were cyclized with substituted hydrazines. The resulting isomeric pyrazole esters 9 and 10 were separated and ...

Related Articles:

One-pot regioselective synthesis of meta-terphenyls via [3+ 3] annulation of nitroallylic acetates with alkylidenemalononitriles

[Zhu, Huajian; Shao, Nana; Chen, Tong; Zou, Hongbin Chemical Communications, 2013 , vol. 49, # 70 p. 7738 - 7740]

13C chemical shifts and 1H??13C coupling constants of N??phenyl??, N??p??fluorophenyl??and N??o??nitrophenylpyrazoles

[Begtrup, Mikael; Vedso, Per; Cabildo, Pilar; Claramunt, Rosa Maria; Elguero, Jose; Meutermans, Wim Magnetic Resonance in Chemistry, 1992 , vol. 30, # 5 p. 455 - 459]

Synthesis of bromodifluoromethyl substituted pyrazoles and isoxazoles

[Yang, Xueyan; Shui, Shengxia; Chen, Xi; He, Hai'ou; Wu, Fanhong Journal of Fluorine Chemistry, 2010 , vol. 131, # 3 p. 426 - 432]

More Articles...