开发了一种通过光诱导N-苯基苯甲酰胺分子内环化合成菲啶-6(5 H )-ones的通用简明方法。在氩气和室温下,在甲苯中甲磺酸存在下,通过用 280 nm 紫外灯照射N-苯基苯甲酰胺,得到菲啶-6(5 H )-酮。该机理被说明并认为按照酰胺互变异构、6π-电环化、[1,5]-H 位移、酰胺-亚胺互变异构、酮-烯醇互变异构和放氢的顺序进行。
Palladium-Catalyzed C–H Activation and Cyclization of Anilides with 2-Iodoacetates and 2-Iodobenzoates: An Efficient Method toward Oxindoles and Phenanthridones
Abstract A concise approach to the synthesis of oxindoles and phenanthridones from anilides is described. In the presence of catalytic amount of Pd(OAc)2, 2-iodoacetates and 2-iodobenzoates can be used to functionalize ortho C–H bond of anilides, which subsequently undergo intramolecular cyclization to give the products. A possible reaction mechanism that involves a PdII/PdIV catalytic cycle is proposed
摘要 描述了一种由苯胺合成羟吲哚和菲啶酮的简洁方法。在存在催化量的Pd(OAc)2的情况下,可以使用2-碘乙酸酯和2-碘苯甲酸酯官能化苯甲酸酯的邻位C-H键,随后进行分子内环化以生成产物。在详细的机理研究的支持下,提出了可能的涉及Pd II / Pd IV催化循环的反应机理。 描述了一种由苯胺合成羟吲哚和菲啶酮的简洁方法。在存在催化量的Pd(OAc)2的情况下,可以使用2-碘乙酸酯和2-碘苯甲酸酯官能化苯甲酸酯的邻位C-H键,随后进行分子内环化以生成产物。在详细的机理研究的支持下,提出了可能的涉及Pd II / Pd IV催化循环的反应机理。
Continuous flow photochemistry as an enabling synthetic technology: synthesis of substituted-6(5H)-phenanthridinones for use as poly(ADP-ribose) polymerase inhibitors
作者:Y. Fang、G. K. Tranmer
DOI:10.1039/c5md00552c
日期:——
Methods utilizing continuous flow photochemistry, an enabling synthetic technology, have been developed for the generation of phenanthridinones via an intramolecular photochemical cyclization of 2-chlorobenzamides for the purposes of generating poly(ADP-ribose) polymerase inhibitors. Herein we report 16 examples of a single-step flow photocyclization which produces substituted phenanthridinones in
A traceless directing group assisted Co-catalyzed C(sp2)–H carbonylation of ortho-arylanilines for the synthesis of free (NH)-phenanthridinones in metal-based-oxidant-free fashion was accomplished. This protocol employs diisopropyl azodicarboxylate as the CO source and oxygen as the sole oxidant, and provides good yields with various functional tolerance. The methodology has been applied for the total
Gas-phase thermolysis of benzotriazole derivatives. Part 3: Kinetic and mechanistic evidence for biradical intermediates in pyrolysis of aroylbenzotriazoles and related compounds
作者:Nouria A. Al-Awadi、Bobby J. George、Hicham H. Dib、Maher R. Ibrahim、Yehia A. Ibrahim、Osman M.E. El-Dusouqui
DOI:10.1016/j.tet.2005.06.028
日期:2005.8
Gas-phase pyrolysis (static and FVP) of 1-aroylbenzotriazoles gave the corresponding substituted benzoxazole, benzimidazole, benzamide, N-phenylbenzamide, phenanthridin-6(5H)-one derivatives and 1-cyanocyclopentadiene. The present kinetic and mechanistic findings also provide further evidence of the involvement of biradical or carbene reactive intermediates in the reaction pathway of gas-phase pyrolysis
An efficient synthesis of free (NH)-phenanthridinones through Pd-catalyzed C(sp(2))-H aminocarbonylation of unprotected o-arylanilines under an atmospheric pressure of CO has been developed. Some ortho heteroarene substituted anilines as well as N-alkyl protected o-arylanilines are also suitable substrates for this C-H aminocarbonylation reaction.