A general synthesis of bridged isoxazolidines from a double hetero-Michael addition of N-substituted hydroxylamines to quinone monoketals has been developed. The different addition order of N-benzylhydroxylamine and N-Boc hydroxylamine is also discussed. Moreover, the various functionalities in the isoxazolidine products allow facile derivatization.
Direct synthesis of anilines and nitrosobenzenes from phenols
作者:A. H. St. Amant、C. P. Frazier、B. Newmeyer、K. R. Fruehauf、J. Read de Alaniz
DOI:10.1039/c6ob00073h
日期:——
A one-pot synthesis of anilines and nitrosobenzenes from phenols has been developed using an ipso-oxidative aromatic substitution (iSOAr) process. The products are obtained in good yields under mild and metal-free conditions. The leaving group effect on reactions that proceed through mixed quionone monoketals has also been investigated and a predictive model has been established.
已经使用ipso-氧化性芳族取代(i S O Ar)方法开发了一种从苯酚一锅合成苯胺和亚硝基苯的方法。在温和且不含金属的条件下,可以以高收率获得产品。还研究了离去基团对通过混合的醌酮单缩酮进行的反应的影响,并建立了预测模型。
Mixed Quinone Monoketals via Iodobenzene Diacetate Oxidation
作者:Amy E. Fleck、Julie A. Hobart、Gary W. Morrow
DOI:10.1080/00397919208021090
日期:1992.1
Abstract Oxidation of p-methoxyphenol, 4-methoxynaphthol and 4-acetamidophenol with iodobenzenediacetate in various alcohols as solvent afforded the corresponding mixed quinone or naphthoquinone monoketals in good yield. Oxidation of p-methoxyphenol in the presence of sorbyl alcohol led to in situ intramolecular Diels-Alder reactions proceeding by way of the corresponding mixed quinone monoketal.
An efficient selective synthesis of C- and O-phosphoryl-substituted phenols from easily available diaryl H-phosphine oxides with quinone monoketals (QMAs) has been developed. With the assistance of opponent characteristic additives (e.g., H2O and Et3N), diaryl H-phosphine oxides could selectively proceed the allylic- and 1,6-substitution to conjugate with the C-/O- positions of QMAs. The reported protocol