Metal-Free 2,2,6,6-Tetramethylpiperidin-1-yloxy Radical (TEMPO) Catalyzed Aerobic Oxidation of Hydroxylamines and Alkoxyamines to Oximes and Oxime Ethers
作者:Sebastian Wertz、Armido Studer
DOI:10.1002/hlca.201200175
日期:2012.10
TEMPO‐Mediatedoxidation of hydroxylamines (=hydroxyamines) and alkoxyamines to the corresponding oxime derivatives is reported (TEMPO=2,2,6,6‐tetramethylpiperidin‐1‐yloxy radical; Scheme 2). These environmentally benign oxidations proceed in good to excellent yields (Table 1). For alkoxyamines, oxidation to the corresponding oxime ethers can be performed by using dioxygen as a terminal oxidant in
Total Synthesis of (−)-Martinellic Acid via Radical Addition−Cyclization−Elimination Reaction
作者:Atsushi Shirai、Okiko Miyata、Norimitsu Tohnai、Mikiji Miyata、David J. Procter、David Sucunza、Takeaki Naito
DOI:10.1021/jo800560p
日期:2008.6.1
The asymmetric total synthesis of martinellic acid, the first pyrrolo[3,2-c]quinoline alkaloid found in nature, is described. Three key steps in our synthesis of (−)-martinellic acid are the Bu3SnH-promoted radical addition−cyclization−elimination (RACE) reaction of an oxime ether with an α,β-unsaturated ester to generate the pyrrolo[3,2-c]quinoline core, a chemoselective lactam carbonyl reduction
描述了天然存在的第一种吡咯并[3,2- c ]喹啉生物碱马汀酸的不对称全合成。我们合成(-)-马来酸的三个关键步骤是肟醚与α,β-不饱和酯的Bu 3 SnH促进的自由基加成-环化-消除(RACE)反应,生成吡咯并[3,2 - c ^ ]喹啉核,化学选择性内酰胺羰基还原,和胍基化Mitsunobu反应条件下进行。还使用SmI 2研究了关键的自由基环化反应。(-)-Martinellic acid由市售的4-溴-3-甲基苯甲酸甲酯以比以前的合成更少的步骤合成,并且总产率得到了提高。