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Synthesis 1991; 1991(5): 362-368
DOI: 10.1055/s-1991-26466
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A Convenient Approach to Dialkyl Heteroarylmethylphosphonates and [Alkylthio(heteroaryl)methyl]phosphonates: Synthesis of Imidazo[1,2-a]pyridine, Imidazo[1,2-a]pyrimidine, Indolizine and Thiazole Derivatives

Martina Drescher* , Elisabeth Öhler, Erich Zbiral
  • *Institut für Organische Chemie der Universität Wien, A-1090 Wien, Währingerstraße 38, Austria
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Publication Date:
29 April 2002 (online)

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The [heteroaryl(hydroxy)methyl]phosphonates 2-5 (indolizines 2, imidazo[1,2-a]pyridines 3, imidazo[1,2-a]pyrimidines 4, and 2-phenylthiazoles 5, are converted readily to the corresponding O,O-thiocarbonates 6-8 and 18 on treatment with p-tolyloxythiocarbonyl chloride in acetonitrile/4-dimethylaminopyridine, while reaction in pyridine/dichloromethane affords the isomeric O,S-thiocarbonates 9-11 and 19, respectively. Homolytic cleavage of both series of compounds proceeds smoothly, using tributyltin hydride/azobisisobutyronitrile (AIBN) in warm toluene to give the new heteroarylmethylphosphonates 12-14 and 20. Conversion of the O,S-thiocarbonates 9-11 and 19 into the synthetically attractive α-methylthio-substituted derivatives 15-17 and 21 is effected efficiently upon saponification with sodium methoxide in methanol and subsequent alkylation with methyl iodide.