Regioselective synthesis of secondary 1,3-dienamides by successive eliminations
摘要:
The regioselective synthesis of secondary 1,3-dienamides 3 (1-N-acylamino-1,3-dienes) is successfully demonstrated by regiospecific base -promoted 1,4 -elimination of (Z)- or (E)-N,N-di-Boc-4-methoxy-2-buten-1 -ylamine 1 followed by mono-Boc elimination in situ. (C) 2015 Elsevier Ltd. All rights reserved,
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.
BIS-PHOSPHATE COMPOUND AND ASYMMETRIC REACTION USING THE SAME
申请人:Terada Masahiro
公开号:US20120330038A1
公开(公告)日:2012-12-27
A novel bis-phosphate compound is provided which can be applied to a wide range of reactive substrates and reactions as an asymmetric reaction catalyst and can realize an asymmetric reaction affording a high yield and a high enantiomeric excess. The bis-phosphate compound has a tetraaryl skeleton represented by General Formula (1). In an asymmetric reaction, an amidodiene and an unsaturated aldehyde compound are reacted with each other in the presence of the optically active bis-phosphate compound to give an optically active amidoaldehyde. The invention allows a reaction such as an asymmetric Diels-Alder reaction to proceed efficiently, which has been difficult with conventional mono-phosphate compounds. Thus, the invention enables an industrially feasible method for the production of optically active amidoaldehydes, optically active β-amino acid derivatives, optically active diamine compounds, optically active pyrrolidine derivatives and optically active dihydropyran derivatives which are useful as products such as medicines, agricultural chemicals and chemical products as well as synthesis intermediates for such products.
Molecular Design of a Chiral Brønsted Acid with Two Different Acidic Sites: Regio-, Diastereo-, and Enantioselective Hetero-Diels–Alder Reaction of Azopyridinecarboxylate with Amidodienes Catalyzed by Chiral Carboxylic Acid–Monophosphoric Acid
A chiral Brønsted acid containing two different acidic sites, chiral carboxylic acid-monophosphoric acid 1a, was designed to be a new and effective concept in catalytic asymmetric hetero-Diels-Alder reactions of azopyridinecarboxylate with amidodienes. The multipoint hydrogen-bonding interactions among the carboxylic acid, monophosphoric acid, azopyridinecarboxylate, and amidodiene achieved high catalytic
The invention relates to new 8-vinyl- and 8-ethinylquinolonecarboxylic acids, process for their preparation, and antibacterial agents and feed additives containing them.
The first example of a catalytic asymmetric vinylogous Povarov reaction is presented. 1-N-Acylamino-1,3-butadienes react selectively at their terminal double bond in the presence of a chiral phosphoric acid catalyst, delivering highly enantioenriched 1,2,3,4-tetrahydroquinolines bearing a synthetically versatile enecarbamate group at the 4-position.