Mechanistic and synthetic aspects of the reaction of γ-halogeno-α,β-unsaturated ketones and esters with simple trialkyl phosphites
作者:Wiesław Waszkuć、Tomasz Janecki
DOI:10.1039/b305717h
日期:——
Phosphorylation of different gamma-halogeno-alpha,beta-unsaturated ketones, ketoesters and diesters 11a-h with simple trialkylphosphites gives 1,3-dienylphosphates 14, cyclopropylphosphonates 15, ketovinylphosphonates 17 and other products depending on the nature and number of activating groups and halogen atoms in the substrate. Most likely the reaction proceeds via oxaphospholene 23 which is in equilibrium
Michael-Induced Ring Closure to 2-Azidocyclopropane-1,1-dicarboxylates and their Staudinger Reduction to 5-Alkoxy-3-(alkoxycarbonyl)pyrrolidin-2-ones
作者:Norbert De Kimpe、Sven Mangelinckx
DOI:10.1055/s-2006-926259
日期:——
synthesis of new β-azidocyclopropanedicarboxylates, a rather unexplored class of conformationally constrained N-protected β-aminocyclopropanecarboxylic acid derivatives, is described. Michael-induced ringclosure (MIRC) of sodium azide to 2-bromoalkylidenemalonates in alcoholic solvents leads to 3,3-dialkyl-2-azidocyclopropane-1,1-dicarboxylates, whereas other polar solvents give increasing amounts of competitive
Reaction of Electrophilic Allyl Halides with Amines: A Reinvestigation
作者:Norbert De Kimpe、Sven Mangelinckx、Dirk Courtheyn、Roland Verhé、Veronique Van Speybroeck、Michel Waroquier
DOI:10.1055/s-2006-942421
日期:2006.7
The Michael-induced ring closure (MIRC) of amines with 2-bromoalkylidenemalonates has been reinvestigated and the reaction products with primary amines have been identified as (2-iminoethyl)malonates and not 2-aminoalkylidenemalonates as previously reported. The (2-iminoethyl)malonates are formed by ring opening of the intermediate unstable 2-aminocyclopropane-1,1-di-carboxylates (β-ACCs) and were
Synthesis of N-Protected β-Aminocyclopropanedicarboxylates and Their Ring Transformation to <i>N</i>-Benzhydryl-3-alkoxycarbonyl-4,4-dialkylpyrrolidin-2-ones
作者:Norbert De Kimpe、Sven Mangelinckx
DOI:10.1055/s-2005-869850
日期:——
An easy and short synthesis of new N-protected β-aminocyclopropanedicarboxylates, a rather unexplored class of highly activated conformationally constrained β-amino acid derivatives, is described. Michael-induced ring closure (MIRC) of diphenylmethylidenamine to 2-bromoalkylidenemalonates leads to 3,3-dialkyl-2-(diphenylmethylidenamino)cyclopropane-1,1-dicarboxylates, the reactivity of which with hydrides was investigated, yielding 3-(alkoxycarbonyl)pyrrolidin-2-ones.
Synthesis and anticonvulsant activity of ethyl 1-(2-arylhydrazinecarboxamido)-2,2-dimethylcyclopropanecarboxylate derivatives
作者:Xianran He、Min Zhong、Tao Zhang、Wen Wu、Zhongyuan Wu、Yuling Xiao、Xianming Hu
DOI:10.1016/j.ejmech.2012.05.037
日期:2012.8
the development of new anticonvulsants, twenty three 1-(2-arylhydrazinecarboxamido)-2,2-dimethylcyclopropanecarboxylate derivatives were synthesized and tested for anticonvulsant activity using the maximal electroshock (MES), subcutaneous pentylenetetrazole (scPTZ) screens, which are the most widely employed seizure models for early identification of candidate anticonvulsants. Their neurotoxicity was