Abstract
Lithiated anions ( 9 ) or ( 10 ) of secondary or tertiary α -amidophosphonates are prepared either by reaction between an α-phosphonyl carbanion and an isocyanate or a carbamate (first strategy), or by condensation of an amide enolate with diethylchlorophosphate (second strategy). Acidic hydrolysis of ( 9 ) or ( 10 ) gives α-amidophosphonate ( 1 ) alkylated or not in the α -position. ( 9 ) and ( 10 ) react with aromatic or aliphatic aldehydes to produce α,β-unsatured secondary or tertiary amides ( 2 ).
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