Preparation of (R)-(1-adamantyl)glycine and (R)-2-(1-adamantyl)-2-aminoethanol: a combination of cobalt-mediated β-ketoester alkylation and enzyme-based aminoalcohol resolution
摘要:
Alkylation of the cobalt(II) complex of ethyl acetoacetate with 1-bromoadamantane affords ethyl 2-(1-adamantyl)acetoacetate, which was converted into rac-(1-adamantyl)glycine 1 and rac-2-(1-adamantyl)-2-aminoethanol 7. This was separated into enantiomers by means of vinyl acetate in the presence of Pseudomonas cepacea. Configuration R was assigned to the enantiomerically pure aminoalcohol (R)-7 on the basis of X-ray diffraction data. Further oxidation of N-protected aminoalcohol (R)-8 afforded enantiomerically pure amino acid (R)-1. (C) 2000 Elsevier Science Ltd. All rights reserved.
Five Roads That Converge at the Cyclic Peroxy-Criegee Intermediates: BF<sub>3</sub>-Catalyzed Synthesis of β-Hydroperoxy-β-peroxylactones
作者:Vera A. Vil’、Gabriel dos Passos Gomes、Maria V. Ekimova、Konstantin A. Lyssenko、Mikhail A. Syroeshkin、Gennady I. Nikishin、Igor V. Alabugin、Alexander O. Terent’ev
DOI:10.1021/acs.joc.8b02218
日期:2018.11.2
actones from silyl enol ethers, enolacetates, and cyclic acetals confirm that the β-peroxylactones indeed correspond to a deep energy minimum that connects a variety of the interconverting oxygen-rich species at this combined potential energy surface. The target β-hydroperoxy-β-peroxylactones were synthesized from β-ketoesters, and their silyl enol ethers, alkyl enol ethers, enolacetates, and cyclic
An insecticidal composition comprising, in admixture with an agriculturally acceptable carrier, an insecticidally effective amount of a compound of the formula: ##STR1## wherein R, R.sup.1, R.sup.2, R.sup.3, R.sup.7, R.sup.8, m, n, and p are as defined herein, and agriculturally acceptable salts thereof, and methods of using the same.
Peroxycarbenium Ions as the “Gatekeepers” in Reaction Design: Assistance from Inverse Alpha‐Effect in Three‐Component β‐Alkoxy‐β‐peroxylactones Synthesis
作者:Vera A. Vil'、Yana A. Barsegyan、Denis V. Barsukov、Alexander A. Korlyukov、Igor V. Alabugin、Alexander O. Terent'ev
DOI:10.1002/chem.201903752
日期:2019.11.13
bisperoxides. Synthesis of β-alkoxy-β-peroxylactones, a new type of organic peroxides, was accomplished by interrupting a thermodynamically driven peroxidation cascade. The higher energy β-alkoxy-β-peroxylactones do not transform into the more stable bisperoxides due to the stereoelectronically imposed instability of a cyclic peroxycarbenium intermediate as a consequence of amplified inverse alpha-effect
作者:A. A. Turmasova、E. S. Spesivaya、Dzh. N. Konshina、V. V. Konshin
DOI:10.1007/s11172-012-0239-7
日期:2012.9
Reactions of adamantan-1-ol with β-dicarbonylcompounds in 1,2-dichloroethane in the presence of In(OTf)3, Ga(OTf)3, Sc(OTf)3, or Cu(OTf)2 give the corresponding adamantylated derivatives in 45–93% yields.
α-(1-Adamantyl)-β-dicarbonyl compounds are prepared by the reactions of the Co(II) complexes of β-dicarbonyl compounds with 1-bromoadamantane. This provides a route to the previously inaccessible 4-(1-adamantyl)-3.5-disubstituted pyrazoles and isoxazoles.