functionality has been reliably transferred into nucleophilic radicals with the loss of one molecule of formaldehyde. Intriguingly, we found that the dehydroxymethylation process can be significantly promoted by the cerium catalyst, and the stabilization effect of the fragmented radicals also plays a significant role. This operationally simple protocol has enabled the direct utilization of primary alcohols as unconventional
Organomanganese (II) reagents XV. Conjugate addition of organomanganese reagents to alkylidenemalonic esters and related compounds
作者:Gérard Cahiez、Mouad Alami
DOI:10.1016/s0040-4020(01)81312-0
日期:1989.1
Organomanganese reagents react with alkylidenemalonic esters or related compounds to give the conjugateaddition products in good yields. Several examples illustrate the scope and the efficiency of this reaction
A Redox‐Active Nickel Complex that Acts as an Electron Mediator in Photochemical Giese Reactions
作者:Thomas van Leeuwen、Luca Buzzetti、Luca Alessandro Perego、Paolo Melchiorre
DOI:10.1002/anie.201814497
日期:2019.4
report a simple protocol for the photochemical Giese addition of C(sp3)‐centered radicals to a variety of electron‐poor olefins. The chemistry does not require external photoredox catalysts. Instead, it harnesses the excited‐state reactivity of 4‐alkyl‐1,4‐dihydropyridines (4‐alkyl‐DHPs) to generate alkyl radicals. Crucial for reactivity is the use of a catalytic amount of Ni(bpy)32+ (bpy=2,2′‐bipyridyl)
β-Scission of Secondary Alcohols via Photosensitization: Synthetic Utilization and Mechanistic Insights
作者:Yeersen Patehebieke、Rima Charaf、Hogan P. Bryce-Rogers、Ke Ye、Mårten Ahlquist、Leif Hammarström、Carl-Johan Wallentin
DOI:10.1021/acscatal.3c05150
日期:2024.1.5
applications in late-stage functionalization of natural products and pharmaceutically relevant compounds. Mechanistic investigations revealed a complex mechanistic manifold, including non-PCET fragmentation and concerted/stepwise PCET. Even though the previously thought PCET type mechanism is compatible with our observations, the non-PCET mechanism most probably constitutes a main pathway.
Decarboxylative conjugate additions and applications thereof
申请人:The Trustees of Princeton University
公开号:US11136349B2
公开(公告)日:2021-10-05
Synthetic methods are described herein operable to efficiently produce a wide variety of molecular species through conjugate additions via decarboxylative mechanisms. For example, methods of functionalization of peptide residues are described, including selective functionalization of peptide C-terminal residues. In one aspect, a method of peptide functionalization comprises providing a reaction mixture including a Michael acceptor and a peptide and coupling the Michael acceptor with the peptide via a mechanism including decarboxylation of a peptide reside.
本文介绍的合成方法可通过脱羧机制进行共轭添加,从而有效地生产多种分子物质。例如,描述了肽残基官能化的方法,包括肽 C 端残基的选择性官能化。在一个方面,肽官能化的方法包括提供包括迈克尔受体和肽的反应混合物,并通过包括肽残基脱羧的机制将迈克尔受体与肽偶联。