Efficient Stereoselective Synthesis of Nitrocyclopropanes by the Oxidative Cyclization of Michael Adducts of Nitroolefins with Activated Methylene Compounds
作者:Renhua Fan、Yang Ye、Weixun Li、Lingfei Wang
DOI:10.1002/adsc.200800452
日期:2008.11.3
An efficientoxidative cyclopropanation of the Michaeladducts of nitroolefins with activatedmethylenecompounds by the combination of iodobenzene diacetate and tetrabutylammonium iodide is reported. Highly functionalized nitrocyclopropanes are synthesized in moderate to good yields via the Michael addition and cyclopropanation with high diastereoselectivity and enantioselectivity under mild conditions
A two-step synthesis of 2,3-disubstituted thiophenes from trans-2-aryl-3-nitrocyclopropane-1,1-dicarboxylates and 1,4-dithiane-2,5-diol is described. The nitrocyclopropane dicarboxylates when treated with boron trifluoride etherate formed aroylmethylidene malonates in situ through ring-opening followed by rearrangement and a Nef reaction, and subsequent addition of 1,4-dithiane-2,5-diol and triethylamine
Tandem Ring Opening/Cyclization of <i>trans</i>
-2-Aryl-3-nitrocyclopropane-1,1-dicarboxylates with 2-Aminopyridines: Access to Pyrido[1,2-<i>a</i>
]pyrimidin-4-one Derivatives
作者:Subramani Selvi、Kannupal Srinivasan
DOI:10.1002/ejoc.201700765
日期:2017.10.10
trans-2-Aryl-3-nitrocyclopropane-1,1-dicarboxylates undergo tandem ring opening/cyclization with 2-aminopyridines in water to afford pyrido[1,2-a]pyrimidin-4-onederivatives.
SnCl<sub>4</sub>-mediated one-pot synthesis of 2,4,5-trisubstituted thiazoles from nitro-substituted donor–acceptor cyclopropanes and thioamides
作者:Maniarasu Meenakshi、Kannupal Srinivasan
DOI:10.1039/d2ob01604d
日期:——
The treatment of nitro-substituted donor–acceptor cyclopropanes (DACs) with SnCl4 and the subsequent reaction with thioamides provide one-pot access to various thiazole derivatives. Aroylmethylidene malonates were produced as intermediates in the reactions and they underwent conjugate addition followed by cyclocondensation with thioamides to afford the products. This work demonstrates the versatility
Reaction of Nitro‐Substituted Donor‐Acceptor Cyclopropanes with Pyrazoles in DMSO: Unexpected Formation of Tandem Kornblum‐Type Ring‐Opening Oxidation/Aza‐Michael Addition Products
作者:Subaramaniam Thangamalar、Kannupal Srinivasan
DOI:10.1002/ejoc.202201084
日期:2023.2.13
Nitro-substituted donor-acceptor cyclopropanes when heated with pyrazoles in DMSO give oxoamination products through tandem Kornblum-type ring-opening oxidation/aza-Michael addition sequence.