Domino transformation of isoxazoles to 2,4-dicarbonylpyrroles under Fe/Ni relay catalysis
作者:Ekaterina E. Galenko、Alexey V. Galenko、Alexander F. Khlebnikov、Mikhail S. Novikov
DOI:10.1039/c5ra01889g
日期:——
The domino reaction of 5-alkoxy- or 5-aminoisoxazoles, under metal relay catalysis, with symmetric 1,3-diketones gives 4-acylpyrrole-2-carboxylic acid derivatives in high yield.
the synthesis of azirine-2-carboxylates from non-halogenated 5-alkoxyisoxazoles. A convenient gram-scale method for the preparation of 2-halo-2H-azirine-2-carboxylic acidesters, thioesters and amides via metal-catalyzed isomerization of 5-heteroatom-substituted 4-haloisoxazoles is developed. The formation of the esters and amides is efficiently catalyzed by Rh2(Piv)4, while FeCl2·4H2O is the catalyst
An isoxazole strategy for the synthesis of alkyl 5-amino-4-cyano-1<i>H</i>-pyrrole-2-carboxylates – versatile building blocks for assembling pyrrolo-fused heterocycles
作者:Anastasiya V. Agafonova、Liya D. Funt、Mikhail S. Novikov、Alexander F. Khlebnikov
DOI:10.1039/d1ob00053e
日期:——
malononitrile under Fe(II) catalysis. Alkyl 5-amino-4-cyano-1H-pyrrole-2-carboxylates are excellent building blocks for various annulation reactions, leading to new derivatives of 1H-pyrrolo[1,2-a]imidazole and pyrrolo[2,3-d]pyrimidine. The DFT calculations of mechanistic details of alkyl 5-amino-4-cyano-1H-pyrrole-2-carboxylate formation are presented.
已经开发了一种完全原子经济的多米诺骨牌方法,该方法通过在Fe(II)催化下,将5烷氧基异恶唑与丙二腈进行反硝化来制备5-氨基-4-氰基-1 H-吡咯-2-羧酸烷基酯。5-氨基-4-氰基-1 H-吡咯-2-羧酸烷基酯是各种环化反应的极好基石,从而导致了1 H-吡咯并[1,2- a ]咪唑和吡咯并[2,3-的新衍生物d ]嘧啶。提出了5-氨基-4-氰基-1 H-吡咯-2-羧酸烷基酯形成机理的DFT计算方法。
Metal/organo relay catalysis in a one-pot synthesis of methyl 4-aminopyrrole-2-carboxylates from 5-methoxyisoxazoles and pyridinium ylides
作者:Ekaterina E. Galenko、Olesya A. Tomashenko、Alexander F. Khlebnikov、Mikhail S. Novikov
DOI:10.1039/c5ob01537e
日期:——
5-methoxyisoxazoles with pyridiniumylides by the use of a FeCl2/Et3N binary catalytic system leading to 1-(5-methoxycarbonyl-1H-pyrrol-3-yl)pyridinium salts followed by hydrazinolysis. The approach permits the introduction of a substituent at the pyrrole nitrogen via a nucleophilic reaction of the pyrrolylpyridinium ylide derived from the salt. Catalytic reduction of the ylides gives methyl 4-piperi
通过使用FeCl 2 / Et 3 N二元催化体系,通过5-甲氧基异恶唑与吡啶鎓烷基化物的中继催化级联反应,以一锅模式合成4-氨基吡咯-2-羧酸甲酯,生成1-(5-甲氧基羰基) -1 H-吡咯-3-基)吡啶鎓盐,然后进行肼解。该方法允许经由衍生自盐的吡咯基吡啶鎓叶立德的亲核反应在吡咯氮处引入取代基。所述酰基的催化还原得到4-哌啶子基吡咯-2-羧酸甲酯。
Fe(II)/Et<sub>3</sub>N-Relay-catalyzed domino reaction of isoxazoles with imidazolium salts in the synthesis of methyl 4-imidazolylpyrrole-2-carboxylates, its ylide and betaine derivatives
作者:Ekaterina E Galenko、Olesya A Tomashenko、Alexander F Khlebnikov、Mikhail S Novikov、Taras L Panikorovskii
DOI:10.3762/bjoc.11.189
日期:——
for the synthesis of methyl 4-imidazolylpyrrole-2-carboxylates from easily available compounds, 5-methoxyisoxazoles and phenacylimidazolium salts under hybrid Fe(II)/Et3N relay catalysis. The products were easily transformed into the corresponding 3-(5-methoxycarbonyl-1H-imidazol-3-ium-3-yl)pyrrol-1-ides, which in turn can be hydrolyzed under basic conditions into the corresponding betaines. A carbene