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
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
An Unusual Route to Synthesize Indolizines through a Domino S
<sub>N</sub>
2/Michael Addition Reaction Between 2‐Mercaptopyridine and Nitroallylic Acetates
作者:Suparna Roy
DOI:10.1002/ejoc.201801426
日期:2019.1.31
An unusual reactionbetween2‐mercaptopyridine and nitroallylic acetates has been demonstrated. The reaction is initiated by a dominosequence including an SN2 reaction at tertiary center followed by a Michael addition and removal of sulfur moiety to deliver substituted indolizines.
已证明2-巯基吡啶与乙酸烯丙酯之间存在异常反应。该反应由在三级中心包括S N 2反应的多米诺序列引发,然后进行迈克尔加成并去除硫部分以递送取代的吲哚嗪。
One-pot regioselective synthesis of functionalized and fused furans from Morita–Baylis–Hillman and Rauhut–Currier adducts of nitroalkenes
作者:Vaijinath Mane、Tarun Kumar、Sourav Pradhan、Savita Katiyar、Irishi N. N. Namboothiri
DOI:10.1039/c5ra11471c
日期:——
Highly functionalized and fused furans have been synthesized via cascadereactions of Morita–Baylis–Hillman and Rauhut–Currier adducts of nitroalkenes with active methylene compounds. The reactions involving SN2′-intramolecular Michael addition or Michael addition-intra-molecular nucleophilic substitution take place in a regioselective manner to afford synthetically and biologically useful furans in
通过Morita–Baylis–Hillman和Rauhut–Currier硝基烯烃与活性亚甲基化合物的加成反应,可以合成高度官能化和熔融的呋喃。涉及S N 2'-分子内迈克尔加成或迈克尔加成-分子内亲核取代的反应以区域选择性方式发生,以中等至良好的产率提供合成和生物学上有用的呋喃。
One-Pot Regioselective Synthesis of <i>meta</i>-Terphenyls via [3 + 3] Annulation of Nitroallylic Acetates with Alkylidenemalononitriles
作者:Elumalai Gopi、Irishi N. N. Namboothiri
DOI:10.1021/jo501193h
日期:2014.8.15
A highly efficient one-pot method has been developed for the synthesis of meta-terphenyls via a regioselective [3 + 3] annulation-elimination sequence involving Morita–Baylis–Hillman (MBH) acetates of nitroalkenes and alkylidenemalononitriles. The reaction takes place in a regioselective manner under mild conditions (Et3N, room temperature) to afford a wide variety of meta-terphenyls bearing aryl,
已开发出一种高效的一锅法,该方法通过区域选择性[3 + 3]消除硝基的序列,涉及硝基链烯和烷基亚甲基丙二酸酯的森田-贝利斯-希尔曼(MBH)乙酸酯合成方法,来合成间三联苯。该反应在温和的条件下(Et 3 N,室温)以区域选择性的方式进行,从而得到各种带有芳基,杂芳基和苯乙烯基的间-三联苯基。这种新颖的[3 + 3]环空反应利用了MBH乙酸酯的1,3-双亲电特性和亚烷基丙二腈的1,3-双亲核特性,并以包括S N 2'取代,分子内6-内-trig的级联方式进行迈克尔加法和双重淘汰。还已经证明了产物的代表性合成转化,例如,转化为间-叔苯基衍生的异吲哚啉酮。