New transformations of the reaction product of 4-(dichloromethylene)-2-phenyl-1,3-oxazol-5(4H)-one with triphenylphosphine
作者:V. S. Brovarets、A. V. Golovenko、V. N. Sviripa、K. B. Zyuz’、A. N. Chernega、B. S. Drach
DOI:10.1007/s11176-005-0005-8
日期:2004.9
4-(dichloromethylene)-4-phenyl-1,3-oxazol-5(4 H )-one with triphenylphosphine, water, and triethylamine gives a stabilized ylide Ph3P=CHCONHCOPh. Its structure was proved by X-ray diffraction. The ylide reacts with hydrogen chloride and phosphorus pentachloride to give a many-center phosphonium reagent with a 1,3-dichloro-2-aza-1,3-diene group, which enters cyclocondensations with hydrazine hydrate,
用三苯基膦,水和三乙胺连续处理可用的4-(二氯亚甲基)-4-苯基-1,3-恶唑-5(4 H )-one,得到稳定的内鎓盐Ph 3 P = CHCONHCOPh。通过X射线衍射证明其结构。内鎓盐与氯化氢和五氯化磷反应,生成具有1,3-二氯-2-氮杂-1,3-二烯基的多中心phospho试剂,该试剂与水合肼,苯肼和苄am进入环缩合反应。这些反应所允许的通式的Ph鏻盐的合成3 \(\ mathop P \限制^ + \)CH 2 HtAn -衍生自1,2,4-三唑或1,3,5-三嗪。环化产物的结构通过光谱方法以及碱性去磷酸化来建立。