Practical β-masked formylation and acetylation of electron-deficient olefins utilizing tetra(n-butyl)ammonium peroxydisulfate
摘要:
Various electron-deficient olefins reacted readily with 1,3-dioxolane or 2-methyl-1,3-dioxlane in the presence of TBAP to afford the corresponding 1,3-dioxolanylated or 2-methyl-1,3-dioxolanylated products in a complete regioselective manner in good to excellent yields. (C) 2011 Elsevier Ltd. All rights reserved.
Hydrogen Atom Transfer Reactions via Photoredox Catalyzed Chlorine Atom Generation
作者:Samantha Rohe、Avery O. Morris、Terry McCallum、Louis Barriault
DOI:10.1002/anie.201810187
日期:2018.11.26
waste‐limiting, and atom‐economical. The catalytic generation of chlorineatoms from chloride ions is one of the most challenging redox processes, where the requirement of harsh and oxidizing reaction conditions renders it seldom utilized in synthetic applications. We report the mild, controlled, and catalytic generation of chlorineatoms as a new opportunity for access to a wide variety of hydrogen atom transfer
A fast photochemical C–C bond formation between cyclic ethers/acetals and olefins using di-tert-butyl peroxide (DTBP) was developed. This method provides easy access to 2-substituted cyclic ethers, and 2- or 4-substituted cyclic acetals. Acyl/formyl groups or diols can be obtained by the hydrolysis of the 2- or 4-substituted cyclic acetals, respectively. The reactions proceeded at room temperature
Formylation of Fluoroalkyl Imines through Visible-Light-Enabled H-Atom Transfer Catalysis: Access to Fluorinated α-Amino Aldehydes
作者:Sen Yang、Shuangyu Zhu、Dengfu Lu、Yuefa Gong
DOI:10.1021/acs.orglett.9b00128
日期:2019.4.5
visible-light-enabled catalytic formylation of fluoroalkyl imines is developed. With readily accessible starting materials and organocatalysts, this method provides a general approach to masked fluoroalkyl amino aldehydes. A synergistic catalytic effect between the photosensitizer and the H atom transfer agent was proven pivotal to this transformation. After removing the mask, free aldehydes can be obtained and
Carbon Nitride Photoredox Catalysis Enables the Generation of the Dioxolanyl Radical for Conjugate Addition Reactions
作者:Viktoria C. Gerken、Erick M. Carreira
DOI:10.1021/acscatal.2c03229
日期:2022.9.2
Graphitic carbon nitride (g-C3N4) is used as photocatalyst in the Giese reaction of dioxolane and a wide variety of electron-deficient olefins. The catalyst is shown to be reusable over five cycles with no changes in catalyst composition, morphology, and characteristics observed by scanning electron microscopy, elemental analysis, infrared spectroscopy, and powder X-ray diffraction.
石墨氮化碳 (gC 3 N 4 ) 在二氧戊环和多种缺电子烯烃的 Giese 反应中用作光催化剂。经扫描电子显微镜、元素分析、红外光谱和粉末 X 射线衍射观察,该催化剂可重复使用五个循环,催化剂组成、形态和特性没有变化。
Safiev, O. G.; Kruglov, D. E.; Popov, Yu. N., Journal of Organic Chemistry USSR (English Translation), 1984, vol. 20, # 5, p. 997 - 1000
作者:Safiev, O. G.、Kruglov, D. E.、Popov, Yu. N.、Zlot-skii, S. S.、Rakhmankulov, D. L.