Synthesis of symmetrical triarylphosphines from aryl fluorides and red phosphorus: scope and limitations
作者:Terence L Schull、Susan L Brandow、Walter J Dressick
DOI:10.1016/s0040-4039(01)01059-0
日期:2001.8
The reaction of arylfluorides with phosphide anion, generated in situ from the reduction of red phosphorus by lithium metal in liquid ammonia, gave symmetrical triarylphosphines in fair to good yields. Phosphonodiamide, sulfonamide, 2-oxazolyl, and nitrile groups were stable to the reaction conditions, while nitro and bromo substituents were not. para-Substituted arylfluorides gave higher yields
Selective P−C(sp<sup>3</sup>
) Bond Cleavage and Radical Alkynylation of α-Phosphorus Alcohols by Photoredox Catalysis
作者:Kunfang Jia、Junzhao Li、Yiyun Chen
DOI:10.1002/chem.201800202
日期:2018.3.2
cleavage and radical alkynylation of α‐phosphorus alcohols to construct phosphonoalkynes is reported. The phosphorus radical is generated upon P−C bond cleavage reaction via the alkoxyl radical through photoredox catalysis with cyclic iodine(III) reagents. Various arylphosphinoyl‐, alkylphosphinoyl‐, phosphonate‐, and phosphonic amide alcohols serve as radical phosphorus precursors to construct phosphonoalkynes
arylphosphorus acid amides have been tested in reactions with alkali metal solutions in liquidammonia. The outcomes of such reactions depend on the structures of the starting materials. Generally, two processes – Birch reduction or cleavage of the P–aryl bond – can be operative. Diarylphosphinic amides tend to undergo double Birch reduction to afford bis(cyclohexadienyl)phosphinic amides.
Chemoselective Reduction of the P=O Bond in the Presence of P-O and P-N Bonds in Phosphonate and Phosphinate Derivatives
作者:Sylwia Sowa、K. Michał Pietrusiewicz
DOI:10.1002/ejoc.201801518
日期:2019.2.7
The chemoselectivereduction of P=O bond in α‐hydroxy and α‐amino phosphonic/phosphinic acid derivatives can be achieved without concomitant scission of their ester and amide bonds using commercially available BH3 complexes. The reduction involves an intramolecular assistance by the proximal OH or NH groups enabling preferential removal of the phosphoryl oxygen.
Siladifluoromethylation and Deoxo-trifluoromethylation of P<sup>V</sup>–H Compounds with TMSCF<sub>3</sub>: Route to P<sup>V</sup>–CF<sub>2</sub><sup>–</sup> Transfer Reagents and P–CF<sub>3</sub> Compounds
作者:Vinayak Krishnamurti、Colby Barrett、G. K. Surya Prakash
DOI:10.1021/acs.orglett.9b00381
日期:2019.3.1
PV–CF2– transfer reagents is disclosed, with multigram scale reactions included. Condition-dependent divergent reactivity under the established conditions is demonstrated by the formation of trifluoromethylphosphines. Both one-pot transformations are operationally simple and employ inexpensive materials. Mechanistic investigations suggest the divergent reactivity originates from a common intermediate,
公开了一种用TMSCF 3进行二烷基膦酸酯和仲膦氧化物的甲硅烷基氟甲基化以生产亲核性P V –CF 2 –转移试剂的方法,包括多克级反应。在确定的条件下,条件依赖性的发散反应性通过三氟甲基膦的形成来证明。两种一锅式转换操作起来都很简单,并且使用廉价的材料。机理研究表明,不同的反应性源自共同的中间体,其中Li +的浓度指导化学选择性。