A general method to prepare monodentate phosphane ligands with mixed substituents

作者: Jennifer E. Phelps , Sara B. Frawley , R. Gregory Peters

DOI: 10.1002/HC.20563

关键词: DenticityMedicinal chemistryProtecting groupChemistryRing (chemistry)HeteroatomReagentSubstituentStereochemistryAlkylGeneral method

摘要: Treatment of (2,2′-biphenylylene)- phosphorchloridite ester [(C12H8O2)PCl] (1) with C2F5Li yields (C12H8O2)PC2F52; treatment 1 Grignard reagents compounds the type (C12H8O2)PR (R = iPr, 5; Et 6). In both cases, 1,3-dioxepine ring formed when 2,2′-biphenol reacts PCl3 to form serves as a protecting group at phosphorus atom; allows stepwise introduction one substituent and prevents undesirable product mixtures associated multiple substitutions phosphorus. Additional 2, 5, 6 Grignard, alkyl-, or aryllithium results in formation unsymmetrically substituted phosphanes. The use (2,2′-biphenylylene)phosphorchloridite starting material for preparation electroneutral phosphanes (Rf)PR2 electron-poor (Rf)2PR is described. © 2010 Wiley Periodicals, Inc. Heteroatom Chem 20:393–397, 2009; Published online InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20563

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