Accessing nitrosocarbonyl compounds with temporal and spatial control via the photoredox oxidation of N-substituted hydroxylamines
作者:Charles P. Frazier、Leoni I. Palmer、Andrey V. Samoshin、Javier Read de Alaniz
DOI:10.1016/j.tetlet.2015.01.024
日期:2015.6
Photoredox catalysis is employed to generate highly reactive acylnitroso species from hydroxamic acid derivatives. The conditions are shown to be comparable to a previously developed transition metal aerobic oxidation and are amenable to a range of transformations including Diels-Alder and ene reactions. This unique application of such an approach gives access to temporal and spatial control in nitroso chemistry. Published by Elsevier Ltd.
Enantioselective Diels-Alder Reaction with an α-Chloronitrose Dienophile Derived from 5-O-Acetyl-2,3-isopropylidenedioxy-d-ribose
Crystalline 5-O-acetyl-2,3-isopropylidenedioxy-d-ribonolactone oxime (8) was synthesised from d-ribose in 40% overall yield. The chloronitroso dienophile 3b was obtained from 8 by oxidation with t-BuOCl and underwent asymmetric Diels-Alder reaction with cyclic and acyclic dienes 10-13 to give crystalline adducts 14a-17a in good yield and excellent enantiomeric excess (93-99%).