Carbonylative coupling of an amino acid-derived organozinc reagent with functionalized aryl iodides: synthesis of kynurenine
作者:Richard F. W. Jackson、Debra Turner、Michael H. Block
DOI:10.1039/c39950002207
日期:——
The utility of the palladium(0) catalysed reaction of the serine-derived organozinc reagent 6 with functionalized aryl iodides, under a carbon monoxide atmosphere, to give protected 4-aryl-4-oxo α-amino acids 8 is illustrated by a short synthesis of L-kynurenine.
Carbonylative coupling of organozinc reagents in the presence and absence of aryl iodides: synthesis of unsymmetrical and symmetrical ketones
作者:Richard F. W. Jackson、Debra Turner、Michael H. Block
DOI:10.1039/a606394b
日期:——
The utility of the palladium(0) catalysed reaction of the
iodoalanine-derived organozinc reagent 6a with functionalised
aryl iodides, under a carbon monoxide atmosphere, to give
protected 4-aryl-4-oxo α-amino acids 8, is illustrated by
a short synthesis of L-kynurenine 4. Treatment of
functionalised organozinc reagents with catalytic
tetrakis(triphenylphosphine)palladium(0) under an atmosphere of
carbon monoxide in the absence of any electrophile leads to the
formation of symmetrical functionalised ketones 9 in good yields.
This reaction is illustrated by a one-step synthesis of protected
(2S,6S)-4-oxo-2,6-diaminopimelic acid 9a from
commercially available compounds. It has been established that
adventitious molecular oxygen plays a key role in the formation
of the symmetrical ketones 9, and that rigorous exclusion of
oxygen can result in substantially higher yields of ketones 8 in
the cross-coupling with some aromatic iodides.
amino acid, is the primary metabolite of tryptophan via the kynurenine pathway. Kynurenine is involved in a variety of biological processes occurring in the human body, notably in the central nervous system. Thus, the study of this molecule offers multiple opportunities for drug discovery; however, an essential prelude for biological studies is to secure the supply of kynurenine and analogues thereof