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Synlett 2008(3): 381-385
DOI: 10.1055/s-2008-1032051
DOI: 10.1055/s-2008-1032051
LETTER
© Georg Thieme Verlag Stuttgart · New York
From Solution-Phase to ‘On-Column’ N-Dearylation of β-Lactams by Silica-Supported Ceric Ammonium Nitrate (CAN-SiO2)
Further Information
Received
31 October 2007
Publication Date:
16 January 2008 (online)
Publication History
Publication Date:
16 January 2008 (online)

Abstract
It has been shown that N-(4-methoxy or 4-ethoxyphenyl) groups can be oxidatively removed by silica gel supported ceric ammonium nitrate (CAN-SiO2) under mild conditions in solution and on column. The yields in these two methods were good to excellent and purification of products is simpler than the general method by CAN. Especially the ‘on-column’ reaction is mild, easy, efficient, and cheap. The lower mobility of CAN-SiO2 makes it safer to handle.
Key words
on-column reaction - N-dearylation - N-unsubstituted 2-azetidinone - β-lactam - ceric ammonium nitrate - silica supported
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