Catalytic Asymmetric Diels-Alder Reaction of Quinone Imine Ketals: A Site-Divergent Approach
作者:Takuya Hashimoto、Hiroki Nakatsu、Keiji Maruoka
DOI:10.1002/anie.201410957
日期:2015.4.7
The catalytic asymmetric Diels–Alder reaction of quinoneimineketals with diene carbamates catalyzed by axially chiral dicarboxylic acids is reported herein. A variety of primary and secondary alkyl‐substituted quinone derivatives which have not been applied in previous asymmetric quinone Diels–Alder reactions could be employed using this method. More importantly, we succeeded in developing a strategy
Aerobic Tetrazine‐Catalyzed Oxidative Nitroso‐Diels‐Alder Reaction of N‐Arylhydroxylamines with Dienecarbamates: Access to Functionalized 1,6‐Dihydro‐1,2‐oxazines
A new organocatalytic and environmentally friendly aerobicoxidative‐catalyzednitroso‐Diels‐Alder (NDA) reaction of N‐arylhydroxylamines with dienecarbamates has been developed. 3,6‐Bis(2,2,2‐trifluoroethoxy)‐s‐tetrazine was found to be an effective catalyst to selectively oxidize various N‐arylhydroxylamines in the presence of molecular oxygen, but in the absence of photostimulation, as a terminal
The invention relates to new quinolone- and naphthyridonecarboxylic acid derivatives which are substituted in the 7-position by a partly hydrogenated isoindolinyl ring, processes for their preparation and antibacterial agents and feed additives containing these compounds.
The invention relates to new 8-vinyl- and 8-ethinylquinolonecarboxylic acids, process for their preparation, and antibacterial agents and feed additives containing them.