Hemiaminal generated by hydration of ketone-based nitrone as an N,O-centered nucleophile in organic synthesis
摘要:
Isoxazolidines that are useful precursors for beta-amino acids have been prepared relying on intermolecular amino Michael addition-intramolecular S(N)2 displacement employing hydroxylamine or hydrate of ketone-based nitrone as an N- and O-centered binucleophile. (C) 1998 Elsevier Science Ltd. All rights reserved.
Photoredox‐Catalyzed Cyclobutane Synthesis by a Deboronative Radical Addition–Polar Cyclization Cascade
作者:Chao Shu、Adam Noble、Varinder K. Aggarwal
DOI:10.1002/anie.201813917
日期:2019.3.18
single‐electron transfer induced deboronative radicaladdition to an electron‐deficient alkene followed by single‐electron reduction and polar 4‐exo‐tet cyclization with a pendant alkyl halide. Key to the success of the methodology was the use of easily oxidizable arylboronate complexes. Structurally diverse cyclobutanes are shown to be conveniently prepared from readily available alkylboronic esters and