Intramolecular Cyclization of Dinitriles via Zirconocene(IV)−Phosphorus Exchange Reactions: Synthesis of σ<sup>3</sup>,λ<sup>3</sup>-1-Phospha- and σ<sup>3</sup>,λ<sup>3</sup>-1,4-Diphospha-2,6-diazines
Dinitrile cyclization reactions leading to new six-membered heterocycles 1-σ3,λ3-phospha-2,6-diazines 3a,b and 1,4-σ3,λ3-diphospha-2,6-diazines 6, 7, and 8 are presented. These syntheses involve dinitrile derivatives, Schwartz reagent [Cp2ZrHCl]n, and phosphorus compounds as promoted cyclization reagents. An X-ray crystal structure of the 1,4-σ3,λ3-diphospha-2,6-diazine 8 is reported.
Cyanophosphine Derivatives: Nitrile or Cyanide Functionality?
作者:Alexandrine Maraval、Alain Igau、Christine Lepetit、Anna Chrostowska、Jean-Marc Sotiropoulos、Geneviève Pfister-Guillouzo、Bruno Donnadieu、Jean Pierre Majoral
DOI:10.1021/om000704h
日期:2001.1.1
Treatment of dicyanophosphines R-P(CN)(2) with 1 equiv of Schwartz's reagent, [Cp2Zr(H)Cl](n), led: (i) via a substitution reaction to the formation of the stable hydrocyanophosphines R-P(H)CN (R = Me, Bu-t, Mes*) or (ii) through a hydrozirconation reaction to the synthesis of the aldiminocyanophosphine R-P(CH=NZrCp2Cl)CN (R = (NPr2)-Pr-i). Further addition of 1 equiv of [Cp2Zr(H)Cl](n) to R-P(H)CN (R = Me, Bu-t, Mes*) gave the primary phosphine R-PH2 (R = Me) or the aldimino secondary phosphine R-P(H)(CH=NZrCp2Cl) (R = Bu-t, Mes*) after the hydrozirconation reaction. Interestingly, the dialdiminophosphorus compound R-P(CH=NZrCp2Cl)(2) (R = (NPr2)-Pr-i) was obtained after addition of [Cp2Zr(H)Cl](n) to R-P(CH=NZrCp2Cl)CN (R = (NPr2)-Pr-i). The difference in reactivity observed for the dicyanophosphines R-P(CN)(2) with the metal hydride [Cp2Zr(H)Cl](n) have been studied with the help of experimental analysis (UV-photoelectron spectroscopy, NMR, IR, X-ray) and computational methods.
Mazieres, M. R.; Roques, C.; Khim, T., Phosphorus, Sulfur and Silicon and the Related Elements, 1990, vol. 49/50, p. 309 - 312
作者:Mazieres, M. R.、Roques, C.、Khim, T.、Majoral, J. P.、Wolf, R.、Sanchez, M.
DOI:——
日期:——
ROQUES, C.;MAZIERES, M. R.;MAJORAL, J. -P.;SANCHEZ, M.;FOUCAUD, A., J. ORG. CHEM., 54,(1989) N3, C. 5535-5539
作者:ROQUES, C.、MAZIERES, M. R.、MAJORAL, J. -P.、SANCHEZ, M.、FOUCAUD, A.