Aminoalkylation of nitriles by iminium ions generated in situ
摘要:
Aminoalkylation of a series of primary and secondary nitriles with N-(alpha-aminoalkyl)benzotriazoles 1 (derived from a variety of secondary amines and aldehydes) proceeds smoothly providing the corresponding beta-aminoalkyl nitriles 5a-j in 66-97% yields. (c) 2005 Elsevier Ltd. All rights reserved.
Carbon acidity. 70. Equilibrium ion pair acidities in tetrahydrofuran of benzylic carbon acids stabilized by an adjacent cyano, carboalkoxy, and sulfonyl substituent. Delocalization and aggregation of ion pairs
The oxazoline-benzyne route to 1,2,3-trisubstituted benzenes. Tandem addition of organolithiums, organocuprates, and .alpha.-lithionitriles to benzynes
作者:Paul D. Pansegrau、William F. Rieker、A. I. Meyers
DOI:10.1021/ja00229a037
日期:1988.10
Le ([dimethyl-4,4 oxazoline-2yl-2]-3) benzyne genere par lithiation de la (chloro-2' phenyl-2 dimethyl-4,4) oxazoline-2, permet d'acceder a des derives polysubstitues du benzene tres varies
Le ([dimethyl-4,4 oxazoline-2yl-2]-3)benzyne generice par lithiation de la (chloro-2' phenyl-2 二甲基-4,4) oxazoline-2, permet d'acceder a des衍生多取代基苯含量不同
A novel synthesis of bicyclo[3.3.0]oct-1-en-3-ones from cyclobutanones through [chloro(p-tolylsulfinyl)methylidene]cyclobutanes with ring expansion
substituent at the 3-position. Heating of the enaminonitriles with H3PO4 in acetic acid gave 2-substituted bicyclo[3.3.0]oct-1-en-3-ones in good to high yields. This method offers a novel and versatile procedure for synthesis of 2-substituted bicyclo[3.3.0]oct-1-en-3-ones from cyclobutanones in good overall yields.
由环丁酮和氯甲基对甲苯基亚砜合成的[氯(对甲苯甲硫基)亚甲基]环丁烷可分三步以高总收率进行处理,过量的氰基甲基锂则可以高产率得到烯腈。用乙酸中的H 3 PO 4加热这些烯腈,得到高产率的2-氰基双环[3.3.0] oct-1-en-3-one。另一方面,用氰基甲基锂处理[氯(对甲苯基亚磺酰基)亚甲基]环丁烷,然后将乙腈同系物的碳负离子锂化,得到在3-位具有取代基的烯氨基腈。用H 3 PO 4加热烯腈在乙酸中的乙酸得到高至高产率的2-取代的双环[3.3.0] oct-1-en-3-one。该方法提供了一种新颖且通用的方法,可从环丁酮以良好的总收率合成2-取代的双环[3.3.0] oct-1-en-3-ones。
Cobalt carbonyl-catalyzed carbonylation of functionalized aziridines to versatile β-lactam building blocks
作者:Nicola Piens、Kristof Van Hecke、Dieter Vogt、Matthias D'hooghe
DOI:10.1039/c7ob00832e
日期:——
carbonylation of different classes of non-activated aziridines with diverse substitution patterns was investigated. Special attention was devoted to selectivity issues and reaction optimization. This study resulted in the regio- and stereospecific synthesis of 24 novel β-lactam target structures in high yields on a multigram scale. The synthetic potential of the newly obtained azetidin-2-ones was illustrated
Radical-mediated nitrile translocation as the key step in the stereoselective transformation of 2-(4-chloro-2-cyanobutyl)aziridines to methyl cis-(1-arylmethyl-4-phenylpiperidin-2-yl)acetates
作者:Karel Vervisch、Matthias D'hooghe、Karl W. Törnroos、Norbert De Kimpe
DOI:10.1039/c2ob07062f
日期:——
Non-activated 2-(4-chloro-2-cyano-2-phenylbutyl)aziridines were used as building blocks for the stereoselective synthesis of novel cis-2-cyanomethyl-4-phenylpiperidines via a microwave-assisted aziridine to piperidine ring expansion followed by a radical-induced nitrile translocation through initial formation and subsequent cleavage of intermediate bicyclic iminyl radicals. Furthermore, these 2-(cyanomethyl)piperidines were shown to be eligible substrates for the preparation of methyl cis-(1-arylmethyl-4-piperidin-2-yl)acetates through a Pinner reaction using gaseous HCl in methanol.
Vinylsulphones (1) were subjected to nucleophilic addition by α-lithionitriles (2) and gave cyclized products, 3-oxothian 1,1-dioxides (3) or cyclopropane derivatives (4), in satisfactory yields according to the substituents on the reagents. The cyclopropanation reactions could be extended to the formation of cyclopropyl sulphides (12)–(16) in good yields.