A Preliminary Approach to Nonenolizable β,β-Tricarbonyls: Assembly of a Hyperevolutin Prototype1
摘要:
A synthetic approach to the h perevolutin A acylated phloroglucinol ring system is described. Thus, intramolecular allene-nitrile oxide cycloaddition of 10 was used to construct the bicyclic framework and vicinal quaternary centers in cycloadduct 20 in the key bond-forming step. Treatment of 20 with Raney nickel and hydrogen gas produced primary enamine 21 which contains a nonenolizable, beta,beta-tricarbonyl group in latent form.
Process for the preparation of 2,2 dialkyl-arylidene-cycloalkanones
申请人:Bayer Aktiengesellschaft
公开号:US05663447A1
公开(公告)日:1997-09-02
A particularly advantageous process for the preparation of 2,2-dialkyl-arylidene-cycloalkanones is characterized in that 2-alkyl-arylidene-cycloalkanones are reacted with alkyl halides in the presence of metal hydroxides and tertiary alcohols.
Fleming, Ian; Higgins, Dick; Lawrence, Nicholas J., Journal of the Chemical Society. Perkin transactions I, 1992, # 24, p. 3331 - 3350
作者:Fleming, Ian、Higgins, Dick、Lawrence, Nicholas J.、Thomas, Andrew P.
DOI:——
日期:——
Rotational equilibria in 1,2,6-trisubstituted pyridinium cations and reactions of 2-Isopropylpyrylium cations
作者:Alan R. Katritzky、Socrates N. Vassilatos、Mateo Alajarin-Ceron
DOI:10.1002/omr.1270211002
日期:1983.10
Abstract2‐Isopropyl‐6‐phenyl‐ and 2,6‐diisopropyl‐pyridiniums with bulky 1‐substituents show temperature‐variable NMR spectra which are interpreted in terms of restricted rotation. 2‐Isopropyl‐4,6‐diphenylpyrylium can be deprotonated at the isopropyl group to give an anhydro base which forms new pyryliums with electrophiles.
Introduction of the Angular Methyl Group. The Preparation of cis- and trans-9-Methyldecalone-1<sup>1</sup>
作者:William S. Johnson
DOI:10.1021/ja01247a018
日期:1943.7
The Synthesis and Fungicidal Activity of 2-Substituted 1-Azol-1-ylmethyl-6-arylidenecyclohexanols
作者:Sergey V. Popkov、Leonid V. Kovalenko、Mikhail M. Bobylev、Oleg Yu. Molchanov、Miron Z. Krimer、Valery P. Tashchi、Yury G. Putsykin