Process for the preparation of dialkyl, pyridine-2,3-dicarboxylates and derivatives thereof from dialkyl dichloromaleate
申请人:AMERICAN CYANAMID COMPANY
公开号:EP0461401A1
公开(公告)日:1991-12-18
There is provided a process for the preparation of substituted and unsubstituted-2,3-pyridinedicarboxylate compounds by reacting a dialkyl dichloromaleate with a source of ammonia and an appropriately substituted α,β-unsaturated aldehyde or ketone.
Process for preparing 2-halo-5-halomethylpyridines
申请人:Reilly Industries, Inc.
公开号:US05229519A1
公开(公告)日:1993-07-20
Disclosed are preferred processes for preparing a 2-halo-5-halomethylpyridine compound. The preferred processes involve cyclocondensing a 2-halo-2-halomethyl aldehyde or ketone of the formula (II) ##STR1## to form a 2-halo-2-halomethylpyridine compound of the formula (III) ##STR2## wherein X is Cl or Br, Y is a cyano group or an aminocarbonyl group, and R, R.sup.1, R.sup.2 and R.sup.3 are, independently, H or an organic radical which does not interfere with the cyclocondensation.
Process for the preparation of dialkyl pyridine -2,3-dicarboxylates and derivatives thereof from dialkyl dichloromaleate
申请人:AMERICAN CYANAMID COMPANY
公开号:EP0548559A1
公开(公告)日:1993-06-30
There is provided a process for the preparation of substituted and unsubstituted-2,3-pyridinedicarboxylate compounds by reacting a dialkyl dichloromaleate with a dialkylamine to form an enamine intermediate and reacting said intermediate with an appropriately substituted α,β-unsaturated aldehyde or ketone and an ammonia source, as shown in Flow Diagam I:
Process for the preparation of dialkyl pyridine-2,3-dicarboxylate and derivatives thereof from dialkyl dichlorosucciante
申请人:AMERICAN CYANAMID COMPANY
公开号:EP0461403A1
公开(公告)日:1991-12-18
There is provided a process for the preparation of substituted and unsubstituted-2,3-pyridinedicarboxylate compounds by reacting a dialkyl dichlorosuccinate with a dehydrohalogenating agent, an ammonia source and an appropriately substituted α,β-unsaturated aldehyde or ketone.