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
Efficient Synthesis of Tetrasubstituted Furans from Nitroallylic Acetates and 1,3-Dicarbonyl/α-Activating Ketones by Feist-Bénary Addition-Elimination
作者:Wan-Yun Huang、Yi-Chieh Chen、Kwunmin Chen
DOI:10.1002/asia.201100988
日期:2012.4
Pure organic: The synthesis of tetrasubstitutedfurans often involves transition‐metal catalysis or metal–halogen exchange reactions. A new approach to these heterocycles employs the Feist–Bénaryaddition–elimination process using nitroallylicacetates and 1,3‐dicarbonyls (see scheme; X=C, O).
纯有机物:四取代呋喃的合成通常涉及过渡金属催化或金属-卤素交换反应。对这些杂环的一种新方法是采用Feist-Bénary加成-消除工艺,该工艺使用乙酸烯丙酯和1,3-二羰基化合物(请参见方案; X = C,O)。
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