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Synthesis 2008(19): 3131-3141
DOI: 10.1055/s-2008-1067273
DOI: 10.1055/s-2008-1067273
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
Preparation of the Maleic Anhydride Nucleus from Dichloro γ-Lactams: Focus on the Role of the N-Substituent in the Functional Rearrangement and in the Hydrolytic Steps
Weitere Informationen
Received
26 May 2008
Publikationsdatum:
05. September 2008 (online)
Publikationsverlauf
Publikationsdatum:
05. September 2008 (online)
Abstract
The preparation of the 3,4-dialkyl-substituted maleic anhydride nucleus, through the functional rearrangement of dichloro γ-lactams, allowed the comparison of various N-substituents in the functional rearrangement step. The 2-pyridyl group proved to be the most appropriate N-substituent for the hydrolysis of the 5-methoxy-1,5-dihydro-2H-pyrrol-2-one intermediate into the 5-hydroxy adduct, and for the hydrolysis of the maleimide nucleus into the maleic anhydride. The oxidation of the 5-hydroxy-1,5-dihydro-2H-pyrrol-2-one into the corresponding maleimide was achieved with manganese(IV) oxide.
Key words
rearrangement - radical reactions - substituent effects - halo compounds - γ-lactams
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