Divergent Reactivity of gem-Difluoro-enolates toward Nitrogen Electrophiles: Unorthodox Nitroso Aldol Reaction for Rapid Synthesis of α-Ketoamides
摘要:
An amination reaction of in situ generated gem-difluoro-enolates has been explored with electrophilic nitrogen sources. While their exposure to azodicarboxylates smoothly produced fluorinated alpha-amino ketones, reaction with nitro-soarenes (nitroso aldol reaction) furnished alpha-ketoamides in very high yields (up to 94%). The reaction is very fast (typically completed within 5 min) and scalable and tolerates various sensitive functional groups. Synthetic utility of this process was highlighted through the production of diverse nitrogen heterocycles and an orexin receptor antagonist.
in a Michael addition promoted oxidative domino three‐component reaction under heterogeneous conditions. This multicomponentreaction sequence led to the development of a general synthesis of highlyfunctionalized pyridines (see scheme), allowing selective and simultaneous incorporation of a substituent at the 4‐position and a synthetically useful functionality at the strategic 2‐position.
Electrochemical low valent cobalt-catalyzed addition of aryl and vinyl chlorides to α-ketoamides via C–Cl bond activation
作者:Prashant S. Shinde、Valmik S. Shinde、Magnus Rueping
DOI:10.1039/d4cc00309h
日期:——
The development of an electrochemical cobaltcatalyzed C–Cl bond activation at room temperature for the nucleophilic addition of aryl and vinyl chlorides to α-ketoamides is described. The overall method operates through an electrochemically induced lowvalentcobalt catalyst that oxidatively adds to aryl or vinyl chlorides affording medicinally important 3-hydroxy oxindole and 3-hydroxypyrrolidinone