Propargyl Alcohols as One-Carbon Synthons: Redox-Neutral Rhodium(III)-Catalyzed C–H Bond Activation for the Synthesis of Isoindolinones Bearing a Quaternary Carbon
作者:Xiaowei Wu、Bao Wang、Yu Zhou、Hong Liu
DOI:10.1021/acs.orglett.7b00089
日期:2017.3.17
C–H activation/subsequent [4 + 1] cyclization reactions between benzamides and propargyl alcohols are reported in which propargyl alcohols serve as unusual one-carbon units. This title transformation led to a series of isoindolinones bearing a quaternary carbon with moderate to good yields without the requirement for external metal oxidants. Due to the mild and simple reaction conditions, this reaction
Are aroylnitrenes ground-state singlets? Photochemistry of .beta.-naphthoyl azide
作者:Tom Autrey、Gary B. Schuster
DOI:10.1021/ja00253a037
日期:1987.9
triplet-sensitized photolyses of ..beta..-naphthoyl azide (BNA) give nitrene-derived products indicative of reaction only from the singlet state of ..beta..-naphthoylnitrene (BNN). The triplet nitrene is not detected in chemical trapping or spectroscopic experiments, which readily reveal related intermediates. The results require that the energy of singlet BNN be very close to or below the energy of triplet
Abstract An efficient Rh-(III)-catalyzed C-H functionalization of N-ethoxybenzamides with 1-alkynylcyclobutanols has been developed. Isoquinolone derivatives have been successfully synthesized through [4 + 2] annulation and ring opening reaction under mild conditions. The advantages of this efficient protocol include broad substrate scope and good to excellent yields. Graphical Abstract
Ruthenium-Catalyzed Redox-Neutral [4 + 1] Annulation of Benzamides and Propargyl Alcohols via C–H Bond Activation
作者:Xiaowei Wu、Bao Wang、Shengbin Zhou、Yu Zhou、Hong Liu
DOI:10.1021/acscatal.7b00031
日期:2017.4.7
transition-metal-catalyzed cycloaddition reactions, in which they generally serve as two-carbon reaction partners. Herein, we report ruthenium(II)-catalyzed redox-neutral [4 + 1] annulation of benzamides and propargyl alcohols, in which propargyl alcohols act as one-carbon units. This synthetic utility of propargyl alcohols led to a series of potentially bioactive N-substituted quaternary isoindolinones
Electrodimerization of <i>N</i>-Alkoxyamides for the Synthesis of Hydrazines
作者:Abudulajiang Nasier、Xihao Chang、Chang Guo
DOI:10.1021/acs.joc.1c01294
日期:2021.11.19
wide range of advanced, highly functionalized hydrazines. Remarkably, an N-centered radical generated from the cleavage of the N–H bond under electrolytic conditions plays a crucial role in this transformation. Furthermore, various N-alkoxyamides bearing different substituents are suitable in this transformation, furnishing the corresponding hydrazines in up to 92% yield.