Design of Chiral Bis-phosphoric Acid Catalyst Derived from (<i>R</i>)-3,3′-Di(2-hydroxy-3-arylphenyl)binaphthol: Catalytic Enantioselective Diels–Alder Reaction of α,β-Unsaturated Aldehydes with Amidodienes
Chiral bis-phosphoric acid 1 was designed to identify a new class of structural features in chiral Brønsted acid catalysts. X-ray diffraction analysis revealed the single atropisomer 1, bearing S axial chirality at 3,3'-biaryl substituents on (R)-binaphthyl and intramolecular hydrogen bonding between the two phosphoric acid moieties. The newly designed bis-phosphoric acid 1 was evaluated in the Diels-Alder
Highly diastereo- and enantioselective synthesis of spirooxindole-cyclohexaneamides through N,N′-dioxide/Ni(<scp>ii</scp>)-catalyzed Diels–Alder reactions
New kinds of spirooxindole-cyclohexaneamides were achieved in up to 99% yield, >95 : 5 dr, and 99% ee via N,N[prime or minute]-dioxide/Ni(II)-catalyzed Diels-Alder reactions.
Quinolone- and naphthyridonecarboxylic acid derivatives
申请人:Bayer Aktiengesellschaft
公开号:US05457104A1
公开(公告)日:1995-10-10
The invention relates to new quinolone- and naphthyridonecarboxylic acid derivatives which have hydrogen in the 6-position, to processes for their preparation, and to antibacterial compositions and feed additives containing them.
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.