Tertiary cyclopropanol systems react with a catalytic amount of vanadyl acetylacetonate under an oxygen atmosphere to afford β-hydroxyketones and β-diketones.
DAST-mediated ring-opening of cyclopropyl silyl ethers in nitriles: facile synthesis of allylic amides <i>via</i> a Ritter-type process
作者:Masayuki Kirihara、Riho Nakamura、Kana Nakakura、Kazuki Tujimoto、Mohamed S. H. Salem、Takeyuki Suzuki、Shinobu Takizawa
DOI:10.1039/d2ob00940d
日期:——
A diethylaminosulfur trifluoride (DAST)-mediated ring-opening reaction of cyclopropyl silyl ethers in nitriles produced allylic amides in moderate to good yields (up to 87%). Time course studies using ReactIR and O-isotopic labeling mechanistic studies suggested that the present reaction occurs via a Ritter-type process, leading to the formation of allylic amides.
二乙氨基三氟化硫 (DAST) 介导的环丙基甲硅烷基醚在腈中的开环反应以中等至良好的产率(高达 87%)产生烯丙基酰胺。使用 ReactIR 和 O 同位素标记机理研究的时间过程研究表明,本反应通过Ritter 型过程发生,导致烯丙基酰胺的形成。
Fragmentation of tertiary cyclopropanol compounds catalyzed by vanadyl acetylacetonate
Tertiary cyclopropanol compounds react with a catalytic amount of vanadyl acetylacetonate in the presence of oxygen affording beta-hydroxyketones and beta-diketones. For 3-substituted-bicyclo[4. 1.0]alkanols, peroxides are obtained, as are the beta-hydroxyketones. Conversely, 2-ethoxycarbonylcyclopropyl silyl ethers produce ethyl gamma-oxocarboxylate derivatives given the same reaction conditions. (c) 2005 Elsevier Ltd. All rights reserved.