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Synthesis 2005(20): 3603-3612
DOI: 10.1055/s-2005-918440
DOI: 10.1055/s-2005-918440
PAPER
© Georg Thieme Verlag Stuttgart · New York
One-Pot Synthesis of N-Chloroacetyl 1-Aminoalkyl Phosphonates - Precursors of 4-Phosphono-β-Lactams
Further Information
Publication History
Received
13 June 2005
Publication Date:
27 October 2005 (online)


Abstract
4-Phosphono-β-lactams are synthesized via a three-step sequence, including final formation of the C3-C4 bond through a phosphorus-stabilized carbanion. The chlorinated precursors can be synthesized via two different methods: a one-pot N-acylation of an aromatic imine followed by addition of a trialkyl phosphite or phosphonylation of a suitable imine followed by N-acylation in a separate reaction step. The former method was preferred because of the ease of the reaction and the good yields obtained.
Key words
acylations - addition reactions - β-lactams - aminophosphonates - acyliminium salts