首次报道了在55°C下DABCO作为有机碱存在下,五元环状氨基磺酸亚胺与各种森田-贝利斯-希尔曼的硝基烯烃/硝基二烯乙酸酯发生有趣的多米诺反应。这种新的合成策略以高产率至优异产率提供了一系列药理学上令人感兴趣的4,6-二芳基吡啶甲酸,并允许在芳基环上实现多种相容性官能团。此外,已经通过独特的方法以高化学产率制备了生物学上令人感兴趣的咪唑并[1,2- a ]吡啶(嘧啶衍生物)。
通过在碱性条件下用戊烯(如β-萘酚,α-萘酚和取代酚)处理硝基烯烃的Morita-Baylis-Hillman乙酸酯,已开发出一种涉及S N 2'反应和分子内氧杂-Michael加成的级联过程。在大多数情况下,苯并呋喃类产品以单一的区域异构体形式形成,收率好至极佳。该方法已成功地用于抗真菌剂异戊呋喃的全合成。
Quinonoid compounds via reactions of lawsone and 2-aminonaphthoquinone with α-bromonitroalkenes and nitroallylic acetates: Structural diversity by C-ring modification and cytotoxic evaluation against cancer cells
作者:Thekke V. Baiju、Renata G. Almeida、Sudheesh T. Sivanandan、Carlos A. de Simone、Lucas M. Brito、Bruno C. Cavalcanti、Claudia Pessoa、Irishi N.N. Namboothiri、Eufrânio N. da Silva Júnior
DOI:10.1016/j.ejmech.2018.03.079
日期:2018.5
Morita-Baylis-Hillmanacetates and α-bromonitroalkenes have been employed in cascade reactions with lawsone and 2-aminonaphthoquinone for the one-pot synthesis of heterocycle fused quinonoid compounds. The reactions reported here utilized the 1,3-binucleophilic potential of hydroxy- and aminonaphthoquinones and the 1,2/1,3-bielectrophilic potential of bromonitroalkenes and Morita-Baylis-Hillman acetates
Synthesis of imidazoles via cascade reaction of nitroallylic acetates with amidines and studies on their trypanocidal activity
作者:Tarun Kumar、Deepti Verma、Rubem F. S. Menna-Barreto、Wagner O. Valença、Eufrânio N. da Silva Júnior、Irishi N. N. Namboothiri
DOI:10.1039/c4ob02561j
日期:——
aza-SN2′-intramolecular aza-Michael addition involving a variety of Morita–Baylis–Hillman acetates of nitroalkenes and amidines in the presence of DABCO at room temperature. The synthetic and biological utility of the products has been demonstrated. In particular, some of the imidazoles exhibited potent activity against T. cruzi, the etiological agent of Chagas disease.
高取代咪唑的一锅两步合成法首次成功地通过级联分子间氮杂-S N 2'-分子间氮杂-迈克尔加成反应进行,涉及各种森田-贝利斯-希尔曼在室温下,在DABCO存在下,硝基烯烃和alk的乙酸盐。产品的合成和生物学用途已得到证明。特别地,一些咪唑显示出对南美锥虫病的致病性克鲁格氏菌的有效活性。
Synthesis of functionalized and fused furans and pyrans from the Morita–Baylis–Hillman acetates of nitroalkenes
作者:Divya K. Nair、Shaikh M. Mobin、Irishi N.N. Namboothiri
DOI:10.1016/j.tetlet.2012.04.084
日期:2012.6
The Morita–Baylis–Hillman (MBH) acetates derived from nitroalkenes and ethyl glyoxylate have been transformed in one pot at room temperature to highly fused and functionalized furans and pyrans in good to excellent yield. The reaction involves a cascade Michael–oxa-Michael addition of β-dicarbonyl compounds to the MBH acetates in the presence of an amine base such as DABCO. An unusual switching of
Cascade Reaction of Morita–Baylis–Hillman Acetates with 1,1-Enediamines or Heterocyclic Ketene Aminals: Synthesis of Highly Functionalized 2-Aminopyrroles
作者:Jin Liu、Qi Li、Zheng-Mao Cao、Yi Jin、Jun Lin、Sheng-Jiao Yan
DOI:10.1021/acs.joc.8b02594
日期:2019.2.15
for the construction of two kinds of fully substituted pyrroles, including 2-aminopyrroles and bicyclic pyrroles from Morita–Baylis–Hillman (MBH) acetates with 1,1-enediamines (EDAMs), or heterocyclicketeneaminals (HKAs) via base-promoted tandem Michael addition, elimination, and aromatization sequence has been developed, affording the expected products in moderate to excellent yields. This methodology
Imidazoles from nitroallylic acetates and α-bromonitroalkenes with amidines: synthesis and trypanocidal activity studies
作者:Elumalai Gopi、Tarun Kumar、Rubem F. S. Menna-Barreto、Wagner O. Valença、Eufrânio N. da Silva Júnior、Irishi N. N. Namboothiri
DOI:10.1039/c5ob01444a
日期:——
Cascade reactions of amidines with nitroallylic acetates and α-bromonitroalkenes provide potentially bioactive imidazoles in good to excellent yields in most cases. While 2,4-disubstituted imidazol-5-yl acetates are formed in the first case, 2,4-disubstituted imidazoles, bearing no substituent at position 5, are the products in the second case. These two series of imidazoles, viz. 2,4,5-trisubstituted