Lewis Acid Catalyzed Formal [3+2] Cycloaddition of Donor-Acceptor Cyclopropanes and 1-Azadienes: Synthesis of Imine Functionalized Cyclopentanes and Pyrrolidine Derivatives
作者:Kamal Verma、Prabal Banerjee
DOI:10.1002/adsc.201700744
日期:2017.11.10
Lewisacidcatalyzed formal [3+2] cycloadditions of 1-azadienes with donor acceptor cyclopropanes to synthesize varieties of imine functionalized cyclopentanes and pyrrolidine derivatives in moderate to high yield have been developed. Moreover, pharmaceutically relevant azabicyclo[3.2.1]octane, bearing two all-carbon quaternary stereogenic centers at the bridgehead positions, has been synthesized by
Synthesis of Indenopyridine Derivatives <i>via</i>
MgI<sub>2</sub>
-Promoted [2+4] Cycloaddition Reaction of <i>In-situ</i>
Generated 2-Styrylmalonate from Donor-Acceptor Cyclopropanes and Chalconimines
作者:Kamal Verma、Prabal Banerjee
DOI:10.1002/adsc.201800598
日期:2018.10.4
An unexpected MgI2‐promoted [2+4] cycloaddition reaction of in‐situ generated 2‐styrylmalonate from donor‐acceptor cyclopropanes with chalconimines to synthesize highly substituted indenopyridine derivatives under the mild reaction conditions have been developed. Additionally, these derivatives were utilized for the synthesis of highly substituted 9‐membered lactam by oxidative C=C bond cleavage and
Lewis Acid Catalyzed Diastereoselective Cycloaddition Reactions of Donor–Acceptor Cyclopropanes and Vinyl Azides: Synthesis of Functionalized Azidocyclopentane and Tetrahydropyridine Derivatives
作者:Raghunath Dey、Prabal Banerjee
DOI:10.1021/acs.orglett.6b03276
日期:2017.1.20
Lewisacidcatalyzed [3 + 2]-cycloaddition reaction of donor–acceptor cyclopropanes with vinyl azides has been developed to obtain diastereomerically enriched azidocyclopentane derivatives. In addition, thermal chemoselective ring expansion of azidocyclopentanes to tetrahydropyridine derivatives and further diastereospecific reduction to a substituted piperidine derivative, with an excellent yield
Synthesis of Thio‐/Selenopyrrolines
<i>via</i>
SnCl
<sub>4</sub>
‐Catalyzed (3+2)‐Cycloadditions of Donor‐Acceptor Cyclopropanes with Thio‐/Selenocyanates
A highly efficient protocol for the synthesis of thio-/selenopyrrolines has been developed via a SnCl4-catalyzed (3+2)-cycloaddition of aryl thio-/selenocyanates with donor-acceptor cyclopropanes (DACs). The protocol rendered a variety of thio-/selenopyrrolines in good to excellent yields.
Lewis Acid Catalyzed Annulation of Donor–Acceptor Cyclopropane and <i>N</i>-Tosylaziridinedicarboxylate: One-Step Synthesis of Functionalized 2<i>H</i>-Furo[2,3-<i>c</i>]pyrroles
作者:Asit Ghosh、Ashok Kumar Pandey、Prabal Banerjee
DOI:10.1021/acs.joc.5b00705
日期:2015.7.17
An efficient MgI2-catalyzed annulation between donor–acceptorcyclopropane and N-tosylaziridinedicarboxylate to accesshighly substituted 2H-furo[2,3-c]pyrrole bearing two rings and four stereocenters, including one quaternary carbon stereocenter, has been developed. This methodology can be used for the synthesis of biologically active compounds like IKM-159. This work also offers an insight into the
已经开发了一种有效的MgI 2催化的供体-受体环丙烷与N-甲苯磺酰基叠氮基二羧酸酯之间的环合反应,以访问带有两个环和四个立体中心(包括一个季碳立体中心)的高度取代的2 H-呋喃[2,3- c ]吡咯。该方法可用于合成诸如IKM-159的生物活性化合物。这项工作还提供了对环化过程机制的见解。