1999 organo-phosphorus compounds, nonmetal heterocycles

organo-phosphorus compounds, nonmetal heterocyclesS 0087

28 - 207A New and Efficient Strategy for the Preparation of 1,5,2-Diazaphosphorines from Primary β-Enaminophosphonates. —Addition of isocyanates (II) to primary β-enaminophosphonates (I) and (V)affords urea derivatives (III) and (VI) which undergo base-induced heterocy-clization providing an efficient access to the title diazaphosphorines (IV) and(VII), respectively. — (PALACIOS, FRANCISCO; OCHOA DE RETANA,ANA M.; OYARZABAL, JULEN; Tetrahedron 55 (1999) 10, 3091-3104; Dep.Quim. Org., Fac. Farm., Univ. Pais Vasco, E-01080 Vitoria, Spain; EN)

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